They'd probably be able to get away with passive cooling once they shrink to 65nm. I don't see any rush though, with the chip sizes and the commodity process they'll do it when it makes sense for them I guess.
One interesting factor is that eventually the PS3 and Xbox360 will be as cheap to make as the Wii could potentially be. It might take until the 32nm generation for the 360 but it is doable. Not sure on the PS3 though...
Tease.







