Currently, PPC is still important in the high-performance computing, server market. It's hard to estimate whether it will remain to be important in the future. There is certainly a strong movement to arm in this market as well. It's probably the flexibility of the platform that makes it interesting: With arm, you don't get "silicon", you get a "design" you can customize for your needs.
As Apple has shown, there is quite some power in the design. Their arm derivatives are quite powerful, probably the best "arm implementation" you can get right now.
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