Alright, let's generalize this to hell.
1) Companies make lots of different kinds of product A, which plays games.
2) Standard technology evolves, everyone makes and improves on product A's device and useage, eventually evolving into product B, and then product C.
3) New Company makes new product D. It's cheaper, and claims to play games.
4) Product D only plays Product A games.
5) Consumers cry out, "Product D looks like Product C, why doesn't it play all games?"
6) Consumers cry, get tired of things, and no longer want to deal with games on Product D.
Really this fits just as easily into consoles. Are you also upset your PS2 games don't play on a PS1? You need to be, in order for your argument to stand.
In reality, eventually graphics will peak ( probably not for a while ), and subside, thats when gaming will get really good because tech is no longer an excuse to sell a game ( unless the tech is some wacky peripheral, which I'm sure will happen more and more as we get near this peak. )