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I can imagine IBM positioning SPARC as the "open source" CPU option with a broader range of consulting/customization services for smaller customers while keeping PowerPC around for bigger customers... maybe wishful thinking, but it will be interesting to see what happens in any case.
The only thing I want to say here is that, of these two architectures, PowerPC is far more open than Sparc. PPC has been customized for dozens, maybe hundreds of unique loads. Sparc has not. IBM uses it's Fishkill FAB to manufacture custom PPC chips for many different companies. Sparc doesnt come any were near PPC's level of variety. Also as an advanced architecture PPC has a much brighter future then Sparc.
Personally I would absolutely love to see PPC replace x86 as the desktop chip of choice