I certainly haven't had interest in any of the entries in the series for about nine years; XII is the last game released in the series (in the West anyway) that I liked the looks of, and I still haven't gotten around to playing it yet, so make of that what you will. I don't know if it's dead, but it's mostly evolved in a direction that doesn't interest me much. XV might be good, but as Tori pointed out, the development hell does not bode well. Type-0 might also be good, but in both cases it doesn't matter too much because I don't have a PS4 and am not likeky to get one anytime soon. And as for XIV, it may be a good game but I have zero interest in MMORPGs.
So yeah, the series might not be "dead", but I don't have too much interest in it either.