Your (and Adobe's) scheme rests upon the misconception that everyone wants the latest and greatest everything.
I have CS6. If they came out with CS7, I'd probably wait a year (or longer) before buying it, because CS6 does everything I need.
Another thing companies like Adobe forget (Microsoft STILL hasn't learned) is that UI changes SUCK for the end user. I am at maximum productivity and you want to mess up my nuts-n-bolts memory (of how to use the software)? Fark you.
I used to use GIMP exclusively. I could probably switch back and get 90% of everything I need. That last 10% would be painful to give up, but I suppose I could learn to do without.
So, I'll keep running CS6 until I can't install it anymore (Hello, Poser!) and then move to Gimp.