Problem with the RSX is that it's basically an nVidia 7900, modified of course but it's still part of that generation. We've seen some truly spectacular games come out, like Killzone 2, but a lot of this wouldn't be possible without the Cell which can also be used to render graphics through the SPUs (Which is why I talk about Killzone 2). Because of this duality in the graphics rendering I doubt we can push the system more up to the 3D department We are going to see good looking games again, like God of War 3, but at one point code optimization becomes nigh impossible to do, and it will stop there before we reach 3D as we are already using a lot of the system's capabilities.
It might come for PS4 though, and if Sony does it right it will have backwards compatibility at no additional manufacturing cost, and will feature 3D "upscale" of PS3 games