Interesting theory. But isn’t this exactly what white American musicians were doing themselves? For instance, the Beatles started out imitating Elvis, who himself was largely a[n inferior] imitator of black American popular music.
That's a bit of what the movie Hairspray was about. The pause, that is.
edit: honestly, rock and roll probably would have died then if it weren't for the British Invastion. The kids were getting into folk.
(interesting find prompted by other, also interesting, answer)
https://daytrippin.com/2018/10/08/john-lennons-lifelong-obse...