Why not just build a whole new site from scratch? I mean sure we'd lose a ton of thread history and whatnot, but if it's truly as bad as you say, then a clean slate certainly wouldn't be a bad idea.
Because that would be even more awful. Forums in general aren't very active anymore, and the only ones that are still up have been around for a long time. Plus we still get hit from search engine traffic for past issues that may have been resolved, so there's at least still traffic from that.