As noted in Google Minus, G+ shutting down hurts a large RPG community. Over the last few days, most have settled on a startup called MeWe as a replacement. Couple videos on the topic:
I've been trying it out, and it's not bad, it's a functional forum, except for: No public posts (which they're working on), and the very annoying chat popups (which you can disable from notifying you, but can't hide entirely). I don't know if it's going to survive very long, but they're ideologically motivated to privacy and not being Facebook, which is good.
It's unnerving, though, how fast everyone coalesced on this obscure service. There weren't a lot of other good options, though. Facebook is evil, Diaspora doesn't really support the kind of sharing and consistent timeline people need, old-style forums are, as I noted, run by shitty people.
Some people made really weird suggestions, like Youtube or Twitch, posting everything as a video and comments on it? Oh hell no.