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These are primarily desktop-oriented systems and PowerPC is darn near close to dead in the desktop space. It was never huge on the desktop and once Apple, the only company actively pushing PPC for desktop use, dropped PPC it was pretty much inevitable. The boards and CPUs are expensive as compared with X86 or ARM, and there's no real benefit to PPC anymore the way there used to be.
That being said, if there's still enough call for these systems on PPC the community will, I'm sure, make it happen. That's part of the real power of free software, you're not only bound to what the official project leaders want for it if you have the knowledge to do what you want with it.