The main problem is that IBM hasn't been interested in consumer-level development...well, pretty much since the PS/2/MCA debacle. They even sold off their ThinkPad line, and they gave Apple a hell of a time about supporting Altivec on the G5. I'm sure they're not going to be abandoning POWER as long as there's money in it, but I very much doubt they're going to be looking at going back into the consumer market any time soon.