Like most people, as soon as I hear the name ‘Miles Davis’, I think of the famous jazz fusion musician, now deceased.
I am guessing when people under 35 hear the name, the majority of them do not associate that name with anything out of the ordinary. Of course their are the exceptions.
Jazz will always be here with us, just like classical music, but it is nowhere near as popular, as ubiquitous as it was up until about 1985. Most TV shows had a theme song that was affected by jazz phrasings. As George H. said, All Things Must Pass.