I guess the one thing I really don't get is that I don't see a usage case for the forum. What would it do that the current available options (Facebook groups, IRC, other forums) don't fulfill? I'm not really clear on this. I can't see it being used for matchmaking directly, a real-time system makes a lot more sense for that. I imagine that it would end up like the netplay community forum is now, except in Spanish and Portuguese. The other issue I have is that I'm not really sure if people would use it.
Maybe the only reason I see it would be good to have an LA subforum, is just to have a reference point for starters, I mean, a place where LA players could find information in their language about the game, netplay requirements, chats and other players. All this based on MBread popularity as an occidental forum for MeltyBlood when you search on google, etc. About subforum activity I don't think if people would use it too much, but is a nice thing to have at least to orient new players, knowing that one of the main problems of the game here is to find reliable ppl and information to ask about installation, netplay, etc.