It's not like it's being organically and spontaneously created at the Five Spot any more. If it is, it's because somebody decided that's what the "Five Spot" does, and makes that happen by force of will. I suppose a "farmed" version of jazz is what we have, not "free range" jazz. But bebop wasn't sustainable. And people don't drink three-martini lunches any more...
Classical is surprisingly healthy. Well, the performance part is struggling for funding.
There will probably always be something we call "rock" or "rock and roll" but it's probably in its 8th or fifteenth iteration now - these things last about five years, a canon forms for it and that branch solidifies.
I'm old, and I only learned actual rock-and-roll in the 1980s when I played with guys born in the '40s who still knew how. You can hear it in Keef and Charlie of the Stones. There's a hell of a lot of overlap between rock-and-roll and country music for the last 50 years.