We aren't going to expand any subforum until the topic in the main forum gets overwhelmed by one subject. Either that, or if it is counter productive and actually people don't post because they don't know where it should go.
There are posts and opinions elsewhere on what the "real" figures for PbNation are but I know the guys behind well and they do good work. We don't aim to become the next Nation and there are many reasons for this. Firstly, a sense of community is easy to lose and hard to gain, the current system and how busy this place is getting is hopefully testament to the efforts of the mods and the members in keeping things heading in the right direction.
There are many things we could do, fewer things we might do and a couple that we will. The forums are going to consolidate now for a few months at least without changing much, and then we'll revisit things again, but for now I don't see the need to split everything out and just create a bunch of empty forums.