I agree. But Fire Emblem Three Houses was one of the most successful games on the Switch and that's a hardcore strategy JRPG.
Persona 5 is approaching 10 milly sold. I don't think its as "dead" of a genre as people like to say it is. And to your point XIV is arguably the most healthy MMO on market not named WoW (which has been bleeding players for going on 3 years now). And lastly, JRPGs never actually relied on graphical power, that was a Final Fantasy thing. Most JRPGs rely heavily on art style and writing, much more that graphical power. That's the way it kinda always has been.
Persona, Dragon Quest, SaGa, Pokemon, Kingdom Hearts, etc....these were NEVER the most graphically impressive games when they dropped. KH maybe, but even then the draw was the Disney IP and the art style and not that it had the most hyper realistic engine.