Sure, AC may have hit a lull in overall activity, but sites that have been run as long as AC frequently do...and I'll say that as a member of a few other forums, AC certainly isn't the worst. By leaving you certainly aren't helping the "problem" either.
While I understand frustration with low activity, to be fed up over question quality is, to me, a bit absurd. The AC community has always been viewed as a place accepting of newer and/or less experienced members who may ask a lot of questions that could probably be Google-d by now, but that's not the point. I've been to other forums where one of the most common responses is "use the search function." IMHO that defeats the point of having forums where you get a personal response (as much as you can over the interwebs) and the ability to converse back and forth with others. If you are willing to answer questions that are posted, however basic you think they might be, you also increase the chances that the member posing the question will stick around, learn more, and contribute to discussions themselves. That's the reason I'm still here, at least...
If guess if you're looking for higher stimulation, I'd suggest frequenting specialty forums. There are plenty of them...but none I've been a part of have come close to the sense of community at AC. That's not to say there aren't ones out there, but there's a reason I still lurk around here to see what other members are up to...I wish I could post more often myself, but I know that I'd probably get too sucked in for my own good at this point.
Oh well, enjoy wherever you may end up. Can't do much to stop someone who's already made up their mind to the point of needing to announce it the the rest of us...