Speaking as an admin, I think individual national subforums would be a long shot. Remember we would have to create them each time someone asks for one, and archive them when needed. Plus, we really do have the goal of making the layout simpler, and that would go contrary to it.

That said, as a roleplayer, I think individual threads would actually be better. Having subforums would compartmentalise too much the information, and make it tiring for someone to read all the stuff people post. It would be more accessible if we each posted a thread, where we could make as many replies as we wanted, with additional information. You could read one thread and easily more to another without having to click the back button too many times. Perhaps we would have a pinned thread in that hypothetical subforums with an index of all national threads, for ease of access?