It was my impression that the Diversity thread wasn't officially abandoned/locked, but that until/unless there's more relevant information made available either in the comic or from Minna we'd run out of new things (or at least of new things both polite and relevant) to say on the subject, and that the moderators had requested we not keep going over and over the same stuff. (Please correct me if I'm wrong.)
-- I'd be interested in a politics/civics board; and having one might keep the politics out of other threads, where it's possible it's unwanted though I haven't noticed complaints -- complaints might not be on the thread, though, I wouldn't know if the mods have gotten any. However such a board would require extra work from the moderators, and I don't know whether they want to do it.
The amount of work could perhaps be reduced by warning people that the moderation exists but also that it might not take effect immediately. I don't know whether a posting delay is practical on these boards, which would seem to be the other alternative. -- maybe it would also, or alternatively, help to restrict it as I understand the adult-content board is restricted: in order to post you have to have made x number of posts in other boards first and then to ask permission to be admitted?