I was more trying to point to RISC in general ("RISC is good" https://www.youtube.com/watch?v=wPrUmViN_5c). What I really wanted to say is that we've tried but RISC hasn't really been successful in the (mass consumer) market, which because of ARM is only partially true.
In truth you're correct, and ARM is sort of an unruly mess at this point, but that's a much larger discussion.
It's happened, again and again. The ARM CPUs powering your phones are a good example. Maybe with more of a market, POWER9 prices might come down.