Re: RISC-V is the future
I suspect the issue is exactly the same issue as this article. The problem isn't the instruction set - the problem is getting the software ecosystem built around it.
What does RISC-V bring that Arm doesn't have already? As far as I can tell, the only benefit is that it is "free", so the saving is a little bit of licensing cost. However, in the grand scheme of things the Arm fees are pretty inexpensive compared to everything else it costs to build a server grade processor (best guess, given their publicly stated revenue breakdown and shipped CPU volumes every year, so I doubt anyone with enough money to build a competitive chip here really worries about it - it's in the noise.
What does RISC-V not have? A mature architecture (it's fragmenting rapidly with extensions), or any form of mature software ecosystem. The Arm architecture is mature, and has been around at scale for at least 20 years, and yet according to this article is still struggling with a mature-enough software ecosystem in new markets.
Hell, it's exactly the same problem as mass-adoption of desktop Linux too, or VHS vs Betamax. Just because something might (and that's still unproven) be technically good doesn't mean it's going to be well adopted if the alternatives are easier to use and/or marketed better and/or better established.