Good thread. If it's for having random discussions free of lewd images and a forced culture, why not try again a textboard BBS like world4ch? AFAIK they were shut down due to inactivity because imageboard system was more attractive for users, but we would have a greater chance with just one board.

I think the only danger is politics. It divides communities as there are always users of conflicting views, and they just ruin all the "fun" and quality discussion, breeds extremism and cheap slurs which scares away good users, causing the community to collapse and be yet another dumping ground for garbage etc. I am well aware taking measure against these stuff is easier said than done, but I can't think of any other way to achieve what OP is suggesting.