Still , like most ,you only talk about the Gpu side of these consoles (how the game "look")......I guess CPU isn't that important in interactive entertainement.
I'm only looking out about 3-4 years from now, by then I'll be more interested in next-next gen anyways. But if you were to assume a 3-4 year time frame, then I do believe that the gpu still has a more important role than cpu. Take a look at what's out now, whats coming soon, whats planned, etc. Maybe I'm off, but from what I see most games seem to fall into typical cpu use patterns. Sure there will be tweaked AI, better physics, etc, but I can't see any future title that screams for the need of a cpu that is better than what the current machines offer. Using the PC game world to make an example, do you first think "i need a new cpu" or "i need a new video card" when you see future titles?
The need for more gpu though is always immediately apparent. No matter how good a game looks, it never looks good enough. For some anecdotal evidence, just check some of the typical comments on these forums, stuff like:
"I don't want to see jaggies"
"Why aren't they using anisotropic filtering"
"Why does the skin look like plastic"
"What's wrong with the lighting"
"Looks like shit"
You hear gpu related comments all the time. I don't often hear "wow it doesn't have full physics simulation between everyone, I'm not buying it". At least not yet anyways. The goodies that come from the gpu, at this point in time, are more expected and "must have" than the goodies that come from the cpu. At some point this will change, eventually we will demand a certain level of AI, physics, etc. But I don't see things changing dramatically in a 3-4 year time frame.
Maybe I'm wrong? Let's see, take a simple test! Think of the top 5 things you wish would be better in a game you recently played or are currently playing, and see which part of the hardware would most contribute to improving them.