Thanks for sharing your thoughts, ep1str0phy. I think this idea is especially on-the-mark:
Don't you think that these "perverse desires" you're describing just reflect our larger societal desires for stability and comprehensibility -- and the most natural way for people to find that is to look backwards, to the way "things used to be"? Especially in a time when formerly stable-seeming things seem to be falling apart all around us.
I remember reading an interview with the composer Lou Harrison, and he made these same sorts of criticisms that you make about jazz about classical music -- and then he expanded those ideas into critiques of Western thought in general. So I guess we can take your macro view of jazz to MUCH greater macro view. The social forces that you're describing in jazz are the same as those affecting our entire world. It's happening all around us. Old theories aren't really working all that well any more -- but people can't resist their attraction without having something else to replace them.