I'm not really closely following this thread anymore, but I'm not sure about this thinking that somehow the rMB sneaks dated tech on people boxed in to an ecosystem they don't want to leave. There technically isn't any outdated tech inside this machine at all, apart from the built in camera being lower res than what people would have wanted. But this was almost certainly a tradeoff choice because of what they were trying to accomplish in other areas.
At the end of the day, it's obvious they decided to step aside from the "faster/moar stuff" paradigm for this machine and take a punt on a different approach. There was this interesting possibility coming around the corner with a brand new chip series that was intriguingly capable of running a full OS pretty well, while using so little power and producing so little heat that you could conceive of a laptop without a fan. There was this new type of USB format coming online that allowed for a heck of a lot to happen through one very compact port.. not just devices and gadgets but a serving of AC power that not even thunderbolt has been able to carry. Resolution-independence and "retina" displays have come of age and it was time they trickled down to the most compact tier of Apple notebooks. 802.11 AC wifi, iCloud and Air Sharing have all contributed to wireless connectivity being more mature, more reliable and ready to take on a more serious and regular role in people's day to day. The tablet, phablet and smartphone market has shown that people are becoming ever more accustomed to be able to do a lot with something very small and very portable. It's really not hard to see the pieces of the puzzle, and that Apple took a step back, looked at it all and thought hmm, what if we tried to make something that hits hard in a sweet spot that no one has really targeted yet?
Obviously they knew they weren't going to be delivering a sequel to the Air, in terms of raw CPU power at least. But surely it's clear that this wasn't the point.. for years people have been going on and on about how amazing it is that we all carry around in our phones the CPU power of what was a serious workstation of only a few generations ago. The writing has been on the wall for a long time that certain types of things people use computers for are no longer sensitive to having the very fastest bleeding-edge processor you can get. So sure, they made a machine that simply acknowledges this fact, and not just flippantly. They chose it for the very reason that going this way allowed them to offer a form factor (ultra thin), a user experience (fanless operation, a generous workspace with retina that doesn't feel cramped), competitive modern battery life - lots of "features" that you can't necessarily list in a spec sheet, and yet they are real and tangible. Meanwhile they also included top shelf components (like the flash memory storage which is drastically faster than off the shelf SSDs), which people tend to overlook when they make price comparisons.
In any case yes, there's a lot about this machine that's an experiment - Phil Schiller even came out and said so much in an interview. But - they didn't cancel a single machine from the existing lineup with this launch. So yes while you can argue that people in the Apple ecosystem have to work with what products Apple make available, their choices didn't change overnight when this machine was launched. It's just that a new kind of choice came to the market - arguably the kind of choice that might never have appeared if it were only up to PC manufacturers sticking to what we know and using off the shelf components with somewhat less risk-taking and attempts at innovation. That being said, I think it's totally true Apple do sometimes make choices that either corral their users into a certain way of working or losing them altogether. The current Mac Pro is probably a good example of this. I have no idea if it has been a success or not, but I'm sure many power users who are fiercely tied to the "expansion card and internal drive" way of doing things were pretty much shown the door with the end of the last series of Mac Pro. I don't think Apple takes this kind of "end-of-line" attitude very lightly though, and I don't think the rMB is a product that really puts people invested in using Apple products at too much risk of ruining their party. If they nuked their entire portable computer range and replaced it with only rMB-like computers, it'd be a different story... but that seems pretty far fetched I'd say.