People remember the PS3 fat, how it was backwards compatable, bulky, and 600 dollars? Would you perfer if Sony released the PS4 and tacked on a mini PS3 inside of it, at the cost of another 600 dollars? They cut it out because compatability issues because the PS3's architecture was unusual with it's processing cells. Developers didn't know what to do with it. So as they progressed to this new generation, I assume PS3 games wern't simply working outright on the new rig. BluRay discs in and of themselves will hopefully still work, but the way games are read may be different.
People dont' seem to ***** how current PS3s can't do backwards compatability. People will just find any reason to ***** for the sake of bitching. I get it, you want to have all in one like they promised. Perhaps they will devise a system using cloud gaming where we can "rent" games. Subscribe to a service like netflix or in this case, the PSN+ and with a specific fee, can play a library of games so long as the subscription persists. For the sake of owning games we still have our old consoles. I get some people want to trade them in for the sake of a new console, but sony decided that improving the core system and the games that it will be designed to play would be the focus, instead of making sure the library of games would be open during it's transitional period. Agreed that it will make first day perchases more limited, though it could potentially save us a lot of money from them trying to "fix" the backwards compatability issue.
I'm going to be keeping my PS3 for the time being, I still own my old PS1 and 2, and when I want to play those games I lug them out and play on them. If I recall the Xbox360 had horrendus backwards compatability, and people arn't bitching about it anymore. This will be the same. If you want to wait for a price drop, go right ahead, don't count this system completely out until it's been released, maybe it's launch lineup will be good enough to warrent a buy.