I've had a few hits from recruiters lately that mention Ruby on Rails. My experience in the Salt Lake City valley was that several successful businesses started with that stack and now it's just sort of "entrenched". Some have been working to move to Elixir, but they still have to turn wrenches on the old (money-making) stack. It's kind of created this microcosmic COBOL dev-like niche. We still need folks who know this stuff. With all that said, I do think there are new startups that still choose Ruby on Rails for its quick time-to-market ability. So demand definitely varies by location.