I support the idea, In fact i am surprised that the minecraft & rift forums are still up. Minecraft in general have their own smaller communities via minecraft server list. There is even a minecraft forum dedicated to only that game hosted by Curse themselves, those forums are incredibly active and there is hardly a need for another one here on MMO-C.
I am more unfamiliar with Rift, but seeing as they just released a new expansion that *might* boost the activity a bit on there. However the rest of the time it was and probably will be dead. Threads have few replies, really low activity at peak hours.
What i'm trying to say is that there should be a cleanup of inactive forums and adding new ones ( possibly by voting for categories? ) because keeping inactive forums and having them there is just going to take up space for other ones whom could be more active. There has been requests in the past for new forums but they were simply ignored where moderators replied "but how will we know that it will be active blabla", many people showed interest however i doubt the mods even looked at the thread again after they posted one reply.
There needs to be more forums, more variety, more new stuff. Keeping old scrubby abandoned stuff isn't going to help in any way shape of form.