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Apparently, Sony in their infinite "wisdom" has decided to disable other the "other OSs" option in the upcoming firmware revision... for ALL the PS3 models, not just the new slim PS3s which did not have the ability to run linux from the get go.
I think it's got far more to do with Apple dropping the PowerPC architecture years ago. They were the major supplier of consumer PowerPC hardware, now that they're gone PPC is going to fade away, however slowly.
Of course, Linux is the only real hope of modern operating systems on those old Macs...