>>109406340A true split hasn't been tried on any board with any topic yet. Retro games can still be talked about on /v/ and generals can still be made on there as long as they aren't specifically called generals. The pony deal is more containment from the entire website than any specific board.
At this point capeshit isn't just a subgenre of comics and cartoons or television and film. It is it's own entire topic that right now is taking up two boards. A real genuine board made to entirely split off cape stuff from /co/ and /tv/ would be different. If proper moderation were involved all 3 boards could thrive separately and actually discuss their topic instead of being flooded with superheroes 24/7.
Each topic has more than enough content to sustain its own board. Even if that wasn't the case, it shouldn't matter. There are boards dedicated to topics that are beyond niche and have months in between posts in a single thread. Trying a split is not an issue at all, the only issue is that the owner of the site doesn't want to do it.