In the early 1990s, when I was a compound shooter, local clubs in PA would consistenly bring in around 200 shooters in a single 3D shoot. Thre were so many shoots sponsored by clubs, private individuals, and even volunteer fire companies that you could go to a shoot just about every weekend (except for Mothers Day and Easter) from the end of March through September. Me, my Dad, and a few friends never missed a weekend. After a few years, we started getting a little burnt out and I went away to college, so we didn't go to as many. It seems that around the same time the novelty of 3D shoots just seemed to wear off and many of the shoots went under. Those that are still going don't bring in near the number they did before. Like I said, I think the novelty of 3D shoots has just worn off.
Now that I'm only a traditional archer, the only shoots I go to are traditional only. The good thing is that I live in the middle of PA and within a couple hour drive of quite a few around the state. I have noticed that even the big shoot at Denton Hill (ETAR) hasn't been as crowded the past couple years as it was say 10 years ago. So maybe the novely of 3D shoots is starting to wane among traditional shooters as well.