Any fan community about something that's not guaranteed to get constant, meaty releases is eventually going to run out of stuff to talk about. From that point on, activity can be maintened if the community has 1: a strong and dedicated fanwork contingent (I'll include things like mods or homebrew peripheral for retro hardware in that category), or 2:, if its members are willing... to talk about other stuff.
I remember reading an article on Waluigious (written by someone who I guess is an IRL admirer of Comic Book Guy) whose entire thesis was "Why do Mario fan forums have sections for BOOKS and MOVIES? They should talk about BOOK and MOVIES in forums about BOOK and MOVIES! MARIO fan forums shoud only be about MARIO! Graaaaaahhhh!"... Yeah, that's not how communities works. People get bored, subjects get beathen to death, etc. You kinda need the ancilliary stuff to keep people hooked : p.