Every message board/Facebook group/online community goes through similar life cycles, I think. The exception to that is when something big and new happens.
I post on an Alabama Crimson Tide board and the constant influx of new information keeps discussion fresh during the season, but the off-season generally sees the same topics resurrected each year.
On TH, there was a lot of excitement in the early days when you had Lawler, Eclipse, Zeus, GR, etc., coming to market. You also had some big name posters in those days too.
I also post on a Facebook group for band directors that is so overrun with questions about things you should have learned in undergrad that's hard to find anything of depth.
I think Pinstriper may be onto something about how things might change here as the site grows, but to me it's really cool to be in on the ground floor. I'm definitely enjoying the vibe here.