Software is waaaaay behind the curve regarding graphic processors designed for games which has let them become juggernauts.
but
games still lack certain features that require CPU power if you want 'em rendered.
"Game engine, your 300k poly poser person will barf on!" says Yoda :D

Would take a new paradigm to utilize the GPU as a true renderer, and I don't know if it's got the ability, plus they are not so standardized as CPU's are.

And I remember playing FarCry when ti came out and going "OMFG! these graphics rule!" ;)

At some point, real time ART rendering will become possible.

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