I don't think the activity level is alarmingly low on here at all. Is there less people than there used to be? Absolutely. Are there less setlists being posted? Yes, but I think that has more to do with the fact that it's March and they're are not that many exciting tours happening atm. That being said, I agree with manks, we were never a very large community. There are still a solid number of active members and for me at least, that's enough to make a forum worth coming back to.
9/28 Coheed and Cambria
10/10 Limp Bizkit