It's always fun with whatever collectors are around, but the sad reality is, if you look at the photo from Greg's house in 2005, you'll realize how many long term collectors are not active anymore, or at least indifferent.
Though likely stating the obvious, I think this is just a result of time and, like drono said, Topps' take on Wackys. Back in 2005, ANS was really all-new, the series was simple and good. It was nothing fancy and we were all pretty excited about what the future held for the hobby, as Topps resurrected it. IMO, after several series went by and especially after all the sketch cards and border colors and other variations came into play, interest waned. At least, for some of us, me included. Like Dave and others here, I still much prefer vintage items. Even the early ANS didn't excite me too much...but, they were Wackys, so I kept up and collected what I felt was reasonable. The other piece of this puzzle is, of course, that we are human and tend to concentrate on different things at different times in our lives. I suspect quite a few of the folks in that group photo have simply moved on from Wackys...or at least have lowered them on their priority list.
Back on topic, it would be great to have an ensemble of collectors like we had in 2005....but I just doubt that synergy or those days will be back anytime soon.