I don't want the serious business forum to be removed, and I'm not sure if I understand the reasoning. For example, in the Sex Ed thread a little while ago, I had a pretty long debate about chivalry. Then some thoughts about feminism came into my mind, but instead of cluttering up the Sex Ed thread, I made a new one in serious business. If I continued to talk about feminism in that thread, I think we'll both agree it would be bad. Thus, I had to make a new one, and it worked well. I think the general attitude towards debates is "if it is small then okay, but anything big that consumes a thread should go in Serious Business"... with the removal of serious business, big intellectual discussions and debates will be few and far between, if present at all!
Eliminating general chat is a fine thing, but eliminating heavy intellectual discussions? I don't think that is so black and white justifiable. I realize things like this are tough to moderate and people get angry often, but I think it's worth it, even if you restrict discussion. It's important to debate things like chivalry, rights, government involvement, etc. in my opinion. I think it's a nice addition to the community. If the goal of this forum is to be "just MSPA and a few other things", then fine, we don't need serious business. But clearly, it is not. We have a fine community here, and I think the presence of a whole subforum about advice is enough precedent to advocate for a debate/serious business forum.
Of course the decision is up to you. I understand how it is a pain to moderate. It's just sad to see something go that really helped educate me in a lot of things.
EDIT: in general I support this movement, though!