More to discuss than anyone (everyone?) can answer.
There are many answers - musical and sociological. I imagine that there are books out there on WWII and post WWII music and society to be read. Perhaps part of the answer is that what Ornette later called "dancing in your head" occurred. There have been many kinds of dancing - that's one of them.
There are others here who have the sort of minds to tangle with the consequences of the draft, gas rationing, societal changes in both the black & white communities, natural evolvement of musics etc. I'm sure they'll do that. I'd rather experience the music - in my head and otherwise.