I think Jobs made the smart move this time. Apple could never buy chips in enough volume to justify the R&D on chips that mostly went to Apple. They got bit twice on that. Now they're with a supplier who will improve their chips whether or not Apple even exists. Plus Apple can just move to AMD with relatively little effort.
:') He wouldn't have changed, according to him, if the PPC had been upgraded as promised. I don't think he'll move to AMD until he gets disenchanted with Intel. Given his childlike attention span, it won't take long. :')