Honestly, I wish people would consider something about the whole 'they will support the older things' idea which thus far, has proved to be just words:
Remember the cross gen stuff between PS3 and PS4?
Shadow of Mordor and DA : Inquisition exclusively (because I have experience with both)
On the PS3, they ran very poorly and weren't optimized at all ( i.e. like dog shit).
On the PS4, they ran just fine like they were designed to, and were great.
Also the Hyrule Warriors situation:
It runs like crap on the 3DS, and was obviously designed for the n3DS.
Its not like there's not precedent for people's concerns, and they're not small. And there is history to show that this stuff happens, leaving people with the older hardware to feel like they got the lesser version of the game.
You're changing the way an entire branch of consumer electronics has worked. Part of the appeal of consoles is that you don't need to worry about upgrading hardware as often, and its very simple. Buy the console, buy the game, you now have the best looking version of the game on that console. Swapping console generations makes sense, and its a model that has worked very well.
Fragmenting the userbase is going to be problematic, and honestly, I hope this blows up in Sony's face. The old console model has worked just fine for this long, and if I wanted to upgrade my gaming hardware more often, I would just play stuff on PC. The PS4 is now the PoorS4 to me, as it describes how having the launch version makes me feel, and how games presumably for the PS4 (but designed and optimized for the PS4K) will run for the launch version (PoorS4) in the not too distant future (poorly).
Sony needs to step out with some messaging fast, because I don't think I'm the only person with these kinds of concerns / bitter feelings, and the current PS4 sales are going to tank (especially with all the bundles they've announced. At least one person in this thread canceled their bundle). And for everyone saying that the PoorS4 is not inferior, there will soon be a better version that does everything the PoorS4 does, but with graphics and other tricks that make the same 'PS4' games look, work, and play better. That is almost the textbook version of inferior (especially in terms of gaming hardware).