CRPGs based on TT rulesets and classic JRPGs aren't the same kinds of turn-based games. CRPGs have more in common with SRPGs and games like X-COM, the latter of which has been increasing in popularity when you look at all the games with turn-based tactical combat now compared to a decade ago.

There's no way all turn-based games are dying out. Some types are more popular than ever, including Western CRPGs. If anything, it's Realtime with Pause that's getting less popular in that space.