I think you're way off. Like many folks here, I've owned 2 PPC mac's. Actually, I'm still using a PPC Mac (see my sig), I haven't made the switch yet to intel!!

Why is this relevant? Here's why: Because Apple did such a damn fine job in making the underlying hardware transparent to the user - I can sit down and use a PPC Mac running Leopard and it looks and feels and works 100% *exactly* like an intel based Mac. No difference whatsoever, aside from speed. Windows can't claim that - 64 bit Windows is a driver nightmare. Itanium Windows is another driver nightmare. Windows on the DEC Alpha (1995-1996) was the same story before that. The fact is that Apple is the only mainstream desktop OS vendor (Linux doesn't count) that "gets" multi platform and does it right.
How does abandoning PPC for Intel equate to 'getting' multi platform? You imply they offer two or more architectures and make them all feel the same, but frankly, they can't be rid of PPC fast enough according to all the nay-sayers for PPC support in Snow Leopard. They don't WANT to support multi platforms. Isn't that kind of ironic for a company that supposedly 'gets it'?
Given all the talk about how CPUs are pretty much reaching their peak in terms of single core power, I'm not sure they ever really 'needed' to switch over to Intel in the first place. That got them a small speed boost, but now they're talking about 8+ cores, maybe 32+ in a few years. They could have had multi-core PPC instead with Grand Central and saved everyone the headaches of Universal Apps, Rosetta, etc., not to mention abandoning all that software that only runs under Classic. I can run old games like ProPinball on my brand new PC running XP or Vista, but I can't on a brand new Intel Mac because it was an OS8/9 set of games. I can run them on this 1.8GHz upgraded Digital Audio, though (although they don't run smooth in Classic under OSX; you have to use OS9 to play smooth so even Classic isn't/wasn't a great solution for backwards compatibility with apps that just aren't "that" old by Windows standards where almost everything "just works" from 1998 onward, at least on my new XP machine.
What does "accepted widespread platform" mean? It means nothing so long as the OS works and doesn't have an trouble with the hardware. The reason Mac's have been increasing in market share vs. 2005-2006 time frame is not because of intel switch, but rather because of the performance boost provided by the intel switch. PPC was lagging way behind intel in performance. All the reviews gave the PPC mac's poor scores for low
Believe whatever you want, but the ability to run Windows is the real reason the Mac is selling better, IMO. People may have 'liked' the Mac better before Intel, but many would never buy one because they NEEDED to run certain Windows only software. Newer Macs eliminate that problem and allow you to run them at the same time even through virtualization (Fusion, etc.) I don't care how fast PPC could have been or if they could have used multiple processors with this Snow Leopard idea with some new PPC hardware; it wouldn't matter a bit because there would be no Windows compatability and so the Mac would still lose tons of sales for users that NEED Windows. And don't kid yourself. Most of the world NEEDS Windows because it's 90% entrenched across the entire planet and that's where the software is, like or not.
No, Apple's move to Intel was a smart one because the Mac could now run Windows, not because it made them faster. I'm using a 1.8GHz G4 PPC Mac right now. Do I *NEED* a faster CPU? Why would I? What is there you can even do on a Mac that NEEDS more CPU power? It runs Word 2004 just fine. It runs Safari and Firefox with plenty of speed. Unless I'm going to do professional video or something, I don't need more CPU power on a Mac. GAMES are the only big reason you need more CPU and GPU power on ANY computer these days and if you don't game, you don't NEED a newer computer. People won't believe that, of course. They have to have the latest and greatest regardless of actual 'need'. Buying a brand new Macbook won't let me game anyway, so what's the point? The old PPC Mac-Mini had more GPU power (as in a real GPU card in it) than the current Intel one. That's just plain sad, really, especially when you consider the 'appliance' known as AppleTV has a better GPU than their Mac-Mini 'computer'.
The only chipset I want to see Apple 'adopt' instead of Intel is an actual useful GPU for the Macbook and Mac-Mini.
I admit to being skeptical that Apple will abandon Intel CPUs and Northbridge/Southbridge chipsets.
I wonder, instead, if we won't see something like the Commodore Amiga, with specialized support chips?
Agnus, Denise and Paula did wonders two decades ago and considering how technology has advanced, Apple could really define the "digital lifestyle" market with a new set of specialized custom chips.
And by tying the new features and capabilities to the chipset, which they can then patent and copyright up the wazoo and refuse to license, Apple could make OS X on "clone" hardware unappealing because it would be unable to use any of these new technologies. And it would also offer a strong incentive for existing Apple Mac owners to buy new machines to take advantage of the new features.
The problem with that idea is that it takes a specialized company to move chipsets ahead with any chance of beating ANOTHER dedicated GPU company. What Amiga did back then was enter a market full of CGA graphics and case speaker 'blip' sounds and offer something better that had stereo sound (of a sort) and 32-color graphics that could display 4096 colors in a special mode. That was HUGE for 1985, but it doesn't exactly cut it in 2008. Do you seriously think having a custom chipset for something like graphics in 2008 is going to keep up with let alone BEAT a dedicated NVidia or ATI card that can do SLI and other things and that get new and even faster cards out every 6 months?
Well, let's look at the Amiga and see what happened. It took them over 7 YEARS to update the graphics on the Amiga even ONCE (with AGA that could barely manage what VGA had been doing for a couple of years already). The Amiga still didn't have any 16-bit audio built-in, couldn't do any kind of 16-bit graphics for display purposes without some kind of frame-buffer card to add into it, etc. Ultimately, 3rd party companies invented retargetable graphics drivers for the Amiga because Commodore couldn't manage to see 10 feet in front of its own face. Then Commodore went out of business and the Amiga has been pretty much dead ever since. I should know. I used my Amiga 3000 until 1999 and finally caved and bought a PC. Now I've got a new PC and an upgraded used Mac. The Mac is more Amiga like than the PC, but Linux probably has more in common with the Amiga than the Mac in terms of 'feel' (well the Amiga's GUI was never really 'complete'; you needed the CLI/Shell or 3rd party programs like DiskMaster2 to really make certain operations easier to accomplish...kind of like Linux still needs the Shell to do certain things whereas the Mac doesn't NEED the Shell at all and never even had one until OSX came about (because it's really BSD underneath).
So if Apple thought custom chips for something like graphics is a good idea, I hope they're prepared to keep up with the Jonses and update it every 6 months... oh wait, what am I talking about? The Macbook and Mac Mini both use worthless integrated graphics that have less 3D power than my Radeon 9800 Pro in this 7 year old PowerMac. So maybe Apple really doesn't care if their graphics ability doesn't keep up and is only updated every 7 years like with the Amiga? Sadly, that doesn't make me want to stay with the Apple platform. I like the OS, but ultimately I'm going to want good hardware. The reason I have a brand new PC and a used Mac is because it's easy to get good hardware on a PC for cheap and I can play modern games on it. You have to pay out the nose to get 'ok' hardware for OSX (MacPro with the fastest card you can get for it) or hack together a Hackintosh which will STILL only support certain 'behind the times' graphics hardware and then end up having almost no games to play natively on it anyway, so what do I need a NEW Mac for? All the application I use daily on this Mac run just fine on its 1.8GHz 7448 G4 (Browsers, iTunes, e-mail and even Photoshop CS2 all run great). I watch HDTV on my home theater downstairs and use AppleTV to rent HD movies so I don't need it on my PC or Mac. I'll get a PS3 for Blu-Ray and some of the HD gaming and I'll play new PC games on the Windows XP PC here. The Mac will do its duty running my whole house audio system, conducting 'safer' online business and shopping (due to a lack of viruses and less spyware compared to Windows) and some basic photo editing and printing.
So, I seriously hope the REAL plan with Snow Leopard is to get the graphics sub-systems of OSX up to par and have some real plan of attack to make the Mac competitive with 3D in Windows. Otherwise, it'll remain a used G4 on my desk for some time to come. I'll probably get a new Macbook Pro at some point because I want to run Logic Pro in a portable form for writing music, but that's one application specific need and even there I'm thinking about finding a laptop I can turn into a Hackintosh given the MBP's obscenely high pricing. I can get something comparable for the needs I have and still do some light gaming for almost half the price yet a Macbook can't game at all, really so it's a non-option.
Basically, for me it comes down to loving the operating system, but hating the hardware and lack of gaming support. I'm not exactly a hardcore gamer by any standards; I'm still catching up with some 5 year old games, but I do have several newer ones as well. The point is I can't play them on most Macs at all, even WITH boot camp unless I want to spend well over $2400. The new PC only cost me $800 and the total upgraded Mac cost about $1200 so I still came out ahead for my needs than the cost of ONE MacPro and I can use both those computers at the same time doing completely different tasks.
If Apple would start offering upgradeable hardware that could keep up with the hardware used to run Windows, it would better position itself to attract switchers. I don't mind using Boot Camp to play games. I do mind not being able to use the latest and greatest video hardware at any cost on a Mac. I find it ironic given the Mac's history of being a graphical computer that it lags so far behind Windows and even Linux in supporting those areas. Why doesn't OSX offer SLI on a MacPro, for example? If Apple would let ATI or Nvidia have more access to the OS, they might do it for them.