I'm not seeing the kind of traffic that really justifies separate sub-forums. It would make sense if new posts were getting pushed off the first page very quickly, but even with a low setting of 25 topics per page, there are topics on page 1 that haven't seen a reply in almost a week. Maybe that's because certain topics are confined to one thread (politics, games, etc.), and joining in on those after so many posts can be daunting to new users.
Off Topic is a section I really don't care about if I'm being honest, so if the membership wants to split it up, I wouldn't be opposed to it.