They could do great human renders now. but think about it this way. Wehn you start adding environments, and game engines, etc, the limits on polygons and effects you can use decreases, and so the characters have to as well.
If you've seen that boxing game on the Playstation 3 for example, the graphics of the people on that are amazing.
This is only because the computer doesn't have to render much else though, so can just work on these 2 boxers.
In the next 2 or so years, we'll definietly see an improvement.
Now the next next generation of gaming... Well, I'm sure we'll see something then