Not sure till they start pruning it, but suggestions have been made to prune back the Hentai section by getting rid of anything that hasn't been active since around the time megauploads went defunct.
You can't just be throwing threads away willynilly! There's some real important history in some of them! Like all the flame wars that went on in some of them or how Toxic became a mod or something (which I remember happening somewhere in there). We need some kinda of museum.