On the issue of Windows' and the x86 ISA's future?
Well, looking at M$'s intentions to use IBM processor tech in Xbox2, perhaps M$ will use Xbox2 to leverage a position in the PPC market? More likely though, is that PPC fits better into console architecture.
In the near future, I wouldn't be too surprised if the home PC as we currently know it doesnt exist. Replaced by simpler "black box" hybrid console systems.
Given the choice, the average person would opt for a very low cost game/communications/entertainment hub that just works, over current, more tempramental hardware solutions.
Just ask Sony and M$, they're both onto the idea...