The reason is twofold. For one, FFNet.org has been all but abandoned. We do not get many users hitting the main site anymore, which means we don't get many users wandering into the forum.
Second, there isn't a whole lot of activity here compared to other forums, so it's likely that new users get bored.
The fix? ... Either reawaken FFNet.org (which was never all that enormous to begin with) or merge. I'd be more than happy to give you all a space on KingdomHearts3, but I have a feeling you would all hate that very, very much. I think the true root of the problem is the lack of community buzz that Final Fantasy has had the past several years. There simply isn't that much to talk about anymore.
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