(It's late so I've committed the sin of simply posting a reply without reading the entire thread. I apologise if I haven't covered any new ground.)
I would use it, but I don't want one, if that makes sense.
Being sick of anime threads in off topic isn't a good enough reason to create a brand new ghetto (heh) forum for them. If anime threads are getting tedious for the locals it's better to simply ban or rather just discourage anime discussion. Since this is a message board for video games, it's hardly unfair.
The Escapist loses none of its purpose by not catering explicitly to fans of Japanese cartoons. If you want to talk about anime then go to somewhere like AnimeSuki. I like anime but I'm more than happy to keep it out of here, in fact, I'd prefer a moratorium on anime discussion over open acceptance.
We could look at it from another perspective. If we add an anime forum, how long will it be before we have to start adding forums for other miscellaneous or minority interests? We have to draw the line somewhere, so it should be right at the start. If not, we'll turn into IGN.