If we (and everyone else) stop answering these questions, there will be no new forum users. If we create new Homework Questions forum and move these questions there, there will be no traffic in old forums. So I think the best solution is to leave it as it is for now, and reevaluate situation later. Once there will be really high traffic both due to homework and due to other questions - then it will be worth to split forums.
Just POV, nothing more.