Wouldn't it make sense that Shenmue fans would discover and join the forums post-Shenmue 3 announcement? I'm not sure how Shenmue fans talking about Shenmue on a Shenmue fan forum is not contributing to the "actual discussion" considering the game is the reason this place exists.
The Dojo "regulars" have constantly rotated over the years, it's just how it goes. The gang who were clearly regulars when I joined in 2003 at age 13 are all pretty inactive now...and have been for 10+ years.
I mostly posted in the Shenmue forums, which is still true (granted, the off-topic discussions are few and far between these days) but I've come to really respect this place and the members who keep it going, even if it's just an occasional post.
While the forum may be slower and less exciting in 2019 vs 2003, it's also a much more stable environment. There was always some drama going on back then, and the sheer amount of trolling, hacking etc certainly tapered off, what's left is a pretty mature community that I enjoy being a part of, even if it's at an arms-length.