For example, do you see the IBM POWER9 chips continuing to be available in sufficient quantities for the Raptor ecosystem?
Yes, there are many, many years worth of the CPUs available.
And even if there weren't, aftermarket availability would persist. One can
still find piledriver and bulldozer Opterons for socket G34 all these years later being sold out of recycling operations and private sellers. I know I've got IBM Sforza socket CPUs laying around unused right now, that could find their way to ebay in such an event. I think it's the fact that there is a specialized microcosm for both of the previous examples.
This wasn't directed so much to you as it was to the general developer community. We've seen some knee-jerk reactions when bad news comes out, including some people that basically just gave up and said "I'm doing x86 only, ME and vendor blobs are inevitable".
I've seen that defeatist mentality in all manner of other freed technology where it's always rationalized away as "you'll never be able to 100% avoid malicious functionality so you might as well use ____. It's what everyone else is using anyway". I believe this qualifies as nirvana fallacy. Then again, I can't call myself a developer. So I have no plans to stop using my RCS board(s) unless something better comes along.
I fear that the effort to merge the Firefox powerpc64le JIT support will hit similar nontechnical roadblocks.
I don't think so, insofar as I have unofficial OKs once I get it to a point I'm happy with it. I'm just not happy with it yet.
I'm looking forward to the work getting mainlined