I think movement to some sort of social media is pretty much inevitable. I don't think I've ever played a game where the forums are more active than reddit/twitter.
Paradox, for example, still maintains advertises their forums but lots of players still congregate in the subreddits instead.
That feels like a very short-term solution though. Sooner or later reddit is bound to update something in the API that makes the app incompatible.
Plus I'd prefer not to give reddit the engagement.