Not if they go the route of head mounted displays (i.e. nintendo ON); projection, like many speculated with the wii... or who knows... functional 3-d might actually hit it big. so there is quite a few graphic upgrades that could be accomplished next gen, in fact i think this next gen will be the biggest jump.
http://www.ronpaul2008.com/ try to find something you disagree with.... you won't! he is for real.