One unconsidered possibility is that Apple is going to switch to the cell processor for its next-gen Pro models. Perhaps the reason Apple hasn't pushed for 3GHz G5s is because they're busy engineering cell-based Pro hardware. The iMac goes G5, the Pro units use multiple cell processors.
It's not that farfetched. Apple already has an OS that can run on 2 similar processors (plus Intel, if rumors are to be believed.) And you've got to think Apple is acutely aware of the danger of being tied to a single processor type after weathering Motorola's multiyear drought.
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