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I think they already did, but maybe with IBM pushing PPC, it might slowly catch up again.
While I agree that Motorola won't be doing any pushing, I'm not so convinced that IBM won't. Granted, they don't have the same market factors pushing their chip development as Intel and AMD, but the microprocessor market is in a slump and the traditional driving factors are changing quickly. People are no longer out buying PCs just because they run a few hundred Mhz faster than last year's models anymore. Chip manufacturers have to start getting more creative and innovative in their chip designs. From what I can tell, IBM has invested heavily in their ability to research, develop, and produce microprocessors and they may even be the first company to get to 90 and 65 microns, beating both Intel and AMD.
Here's a interesting read from the latest Microprocessor Forum conference regarding IBM's chip development plans for its Power series processors -
http://maccentral.macworld.com/news/2003/10/14/power5
