People want fast chips and they're willing to put up with the heat. Give PPC a few years and you'll see the same thing
Take it from me, you damn well WON'T.
PowerPC has to live in embedded markets where there are tight controls on the heat produced by the chips - the G5 is a joke everywhere except supercomputing and Apple boxes (which are one and the same at the moment.. so..) because of it's incredible heat output.
From Freescale soon and when IBM gets their backsides in gear, you'll see multi-GHz PowerPC processors with more than reasonable (10-20W) power consumption for the featureset.
Maybe a little more than the 3W of the 750CXe or the 10W of the 7447A, but nowhere near 150.
