I don't think it would be wise to remove Soul Eater. Some episode threads haven't got that many posts but some have reached a couple of pages (I guess this depends on the posts/pages setting, though). But anyway, it would be strange to remove it. Especially since I doubt simply placing a series into the Series En Fuego subforum would magically increase the watcher number that much. Maybe it seems redundant to keep a subforum it there are no new series to place there, but also I deem it unreasonable to "force" every season to have exceptional series gathering lots of watchers and discussion.