I've seen this way too many times now. Everyone on vent has gone back to World of Warcraft and no one is listening to how this is completely a cyclical event. I still can't believe I haven't realized that it's simply not worth spending time with them anymore. About a year ago they quit... then they came back a few months ago... then they quit again... now they're back to it. It's becoming a frequent behavior and they don't listen to jack squat. They simply can't stop moving. It's a form of ADD, I say. They're unable to satisfy themselves unless they're going in a circle.
Due to this cyclical nature, I'm also sure of yet a few more things.
1. They're going to quit again.
2. They're going to do the same when both Starcraft 2 and Diablo 3 come out.
3. They're going to keep going to random games and trying to find something fun, only to quit because not everyone is willing to play it or because they simply aren't satisfied with it.
What I'm unsure of is if this stupid cycle is going to go away anytime soon. I know I show the same qualities here on the forum, but that's because mapping seems more like work than it does true fun. Also, here on the forums, other people's enthusiasm is what drives me... not my own.