With all due respect, if someone like me, who isn't exactly the most-liked among some RP Circles here (and I admit I brought it on myself), can get enough players to keep a Group RP alive for two years and three months (and still ongoing), then the genre/platform/hobby isn't dying.

So, no, Forum RP isn't dying. My own game could use more activity due to some players being stalled by IRL matters (heatwaves, hurricanes, and stuff like that), but Forum RP as a whole isn't dying.