The major reason the 52 WoC went downhill is b/c the team wasn't able to keep up every week after a while with new challenges. I can definitely see this idea starting out strong. It depends a lot on those organizing these classes the momentum they will continue with, since I don't think participation will be a huge issue (for the more popular languages and technologies).
If you all want to organize something your own classes, you're welcome to open your own threads in Share Your Project and see what comes of it. If you see this taking off, we can always revisit expanding the scope later. I do know that a lot of the team wouldn't have the time to teach such a class; I know I wouldn't. So I'm not sure how much involvement you're going to have from the Experts/Mentors, as I'm sure many of them are in similar situations, in terms of being busy.