Twitch activity for RuneScape (OSRS and RS3) is very lively, and so is YouTube. The RuneScape subreddits are also rather active (~800 users there now [10:00 PM EST]--compare that to, say, /r/programming [a much larger, but still generally niche subreddit] with ~800 users as well). The game's population is usually above 40k, peaking at 80k during the day (and botting is much less of an issue in RS3--botting contributed tens-of-thousands years ago at a minimum).
As of this post we've got 69k players across... What, 3 or 4 versions of the game? Lost track. That would've been unheard of even a year or two ago. The Reddit thing is interesting. I've been hanging around r/Warframe and we're sitting at ~700 users for a game that is very much not in decline and has a non-negligible console presence
I feel like bringing up some Steam stats not to contribute in a meaningful or informed way (Since I don't know how to statistics as well as the computer science folks that make up 90% of the forum's population), but just because I can,
and because as a Warframe player that detests Runescape the fact that it's got literally twice the current active player count is personally insulting:
don't give up, SkeletonScape! Even in your declining state you're still ahead of Warframe, ARK, and TF2 on one platform
That's not to say the game is in a good place (I'm not going there), but it'll probably be around for a while yet even if our niche forum isn't getting much attention. It probably speaks more toward the game's peak and the fact that we're forum enthusiasts lamenting the death of the forum when literally everyone else seems fine with Reddit and the like.