Traffic and activity never suffered when we moved the domain and I have the statistics to prove it. I'm not going to point fingers or accuse anyone of anything because I haven't been around to see it, but I do know that sites do generally just die out. A lot of luck goes in to having a successful forum (as well as hard work). Having users like Seabs, Dolph, and the other long-term ones are really what you build it on. It's very rare to get those however because normally the flow is new users signing up, posting a little bit, and then leaving. The cycle repeats but it's based on your Google presence and your content quality. There is a lot of intense competition in this niche now and the main two have advantages that this forum doesn't have. One of them having a fantastic domain, Google presence, and 10+ years of indexed quality wrestling content is a mammoth to compete with.
It's not a coincidence that our most active months were when users like the one's I have mentioned had stellar months producing fantastic content in the wrestling sections. As for why the site is slow now, it just seems like the buzz has gone. I built WWEF around community so naturally hid from the responsibilities of rules. I run forums very different to 99% of webmaster's but that doesn't mean I am right. Solidus is one of the best webmaster's I have worked with. People have different styles and users react differently to that; that's how building a community works.
This site isn't DEAD though. Many owners of forum's would still kill for this kind of activity now, so instead of complaining about it, work hard to promote it.