With it looking like the PS3 is going to finish third behind the xbox360 and the Wii I bet you sony is going to make the PS4 a much more reasonable system to own than the PS3 (the expense of the PS3 and its games is what pretty much made it fall behind).
I would assume that the PS4 will be a cheaper system to buy and the games prices will be a little more reasonable as well. It's funny because if you go to alot of stores there are still just as many PS2 games on the shelves as there are 360 games.