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Part of the problem with PPC is how many people have working PPC systems. PS3 was the major home PPC system that people had and it was not great.
Really the drop of PPC is bad news for the PPC chip.
Have this something to do with Sony removing "Other OS" support of the PS3? Coincidental and weird.
Not really, Linux/PS3 was dead already.
It has more to with PPC dying as a consumer architecture.