Actually now I think about it this is probably best done in an extremely regulated fashion.
Make it so that only a couple of new forums are created, such as an 18+ forum, a debates forum and whatever that are limited to certain members based on certain credentials (previous bans, behaviour in those forums, post count, age) and that are just as heavily moderated as other forums.
This would allow the change in quality and matureness of posting in those forums while avoiding all the cliqueness that is associated with allowing members to created their own forums.










LEAGUE