I read your post right the first time, I'm saying that your projections (and yes, projections are opinionated) are ridiculous. The last design generation went from early 2003 and lasted through late 2008, over 5 years. Not 2-4. The MacBook Air is the future of "MacBooks" not "MacBook Pros". And while I don't disagree that such a machine will be the laptop we all use in 10 years, it won't be the laptop we use in 1-2, and there are clear reasons for that. Speculate all you want on Apple's "Back to the Mac" event; if they had wanted to, they could've ushered us all toward that new era now rather than later and we would've bought it. Removing a DVD drive isn't revolutionary, it's stupid. The Mac App Store can't and won't be the ONLY place to buy Mac software; I'm not going to download all of Final Cut Studio either as that's not revolutionary, that's a pain in the ass. PRO people burn DVDs as y'know, there's a PRO app for that, (DVD Studio Pro, if you can recall). They won't nix DVD drives from ANY of their pro machines anytime soon. As for your Apple conspiracy theory that the real overhaul is still out there, note today's rumor of the desktop version of the SSD boot feature we were all waiting for. A lot of these rumors get it only half right, and I'll bet that's one of them.
Again, your current term buying advice is sound, but your predictions make no sense and don't match Apple's MO nor past behavior.