"low power RISC architecture"
Something does not seem right with your statement.

went with x86 for low power and flexibility since the power requirements, demand and cost favoured

and the industry in general. The problem with PPC was that lack of all three was not present during the dark days when

PowerBook consumers did not get a PowerBook G5. This was similar to throwing a pie in

face since it could not keep up with the x86 world.
It is a smart move on

part to have Mac OS X running on both RISC and CISC platforms as it allows for flexibility even though its cost twice as much. Putting all your eggs (Mac OS X is a Golden Egg) into once architecture is just plain lame.

was a big supporter for the RISC architecture and eating its words and going with x86 just leads me to believe that it will be revisited.
Funny when Steve Jobs announced Mac OS X was leading a "double-life" all along comes as no surprise since they planned on using it for iPhone OS X. Hmm