No. One *hugely important* thing Apple recognised is that mobile devices are *not* just small versions of your desktop computer.
There are multiple difference,
* User Interface : OS X is driven by a mouse and keyboard. iPhone OS is driven by a touch screen.
Yeah, a touch screen with a keyboard on it and your finger as a mouse. Very different. People still need to type and point at things.
Plus proper keyboards are coming to iPhone OS 3.2 anyway because Apple have finally come down off their mountain and granted us Bluetooth Keyboard support - like other mobile OS's have had for eons and the iPhone hasn't had for 3 years.
* Capacity : OS X has expandable upgradable storage space. iPhone OS has limited storage space.
That's more a problem with their hardware, not OS. If Apple added a card slot or a USB port to their iPhone OS devices, it wouldn't be a difference and every other mobile OS is ok with external storage options.
* Power management: iPhone OS alters what it offers to keep power demands low. This includes the much maligned multitasking restrictions.
Right, so iPad with 10 hours battery life gets more restrictions than my Macbook which has at best 4 hours life. Yeah, that makes sense.
iPhone OS is not just OS X cut down and pushed onto a portable device. This is why the iPhone/Touch has worked so well, and had good battery life.
The iPhone/Touch has TERRIBLE battery life compared to other manufacturer's devices that have multi-tasking already. eg. my Nokia E71. Full multitasking, 1500mAh battery (more capacity than the iPhone), removable/upgradeable storage and it's smaller/thinner than an iPhone. Battery lasts a couple of days for me in average use running Twitter, push email, permanent VoIP over Wifi, occasional browsing and Ovi/Google Maps. I've all those active now and it's drawing 0.28W. With the screen in standby (backlight off) it draws 0.13W whilst multitasking without missing a beat.
The OS X UI is the traditional desktop metaphor, the iPhone OS has a 'multi-function push-button device' metaphor where you have a universal remote that's also a games console that's also a phone that's also a web-browser that's also a...
I agree and if you can live with those limitations on your phone, and many people can, it's a fine compromise to get passable battery life out of a battery hungry software/hardware stack. I don't think that stretches to the iPad though. The likely iPad usage pattern isn't the same as a phone and the laptop sized screen gives greater scope to multitask. I think even the type of people that maximize every window on desktop Windows/MacOSX will find the iPad restricting. The iPad needs to be much closer to the desktop model, not the iPhone model.
Anyhow,
If this is a move to a Mac App Store, then I'd be worried if I were a Mac developer. If they couldn't get their app into the Mac App Store then they'd be at a big disadvantage.
If it's a move to signed Mac apps and an exclusive store like the iPhone then a lot of developers and users will be off to Windows and Linux and ditching the Mac.
Hopefully it's neither and it's just them reducing the price of developer access beyond the free SDK, which really does seem the most likely. Hopefully Apple isn't THAT stupid despite it's recent boneheaded moves in the patent space.