"Post-Coltrane" works for me...I mean, it's not like Coltrane was the end of the music's evolution, it was just the end of (or, if you prefer, "the apex of") harmonic exploration as a foundation for improvising. after that, plenty of people found other things to do.
O-BOARD SPECIFIC DISCLAIMER: Which is not to say that people still can't use harmonic exploration as a basis for "satisfying" music and such, and whatever you "like" is fine and all that, but for the "hungry spirit", once you get to looking into harmony (and I know, "listeners" don't usually give a rat's ass about this, but the musicians who make the music usually do, so it is relevant at some level), you're going to find that it pretty much has all been done (at least with "Western" harmonic systems), and Trane pretty much brought it to that point. Anybody who wants more than that has places to go now, thanks to some people, and those who don't want more than that have at least as many places to go, thanks to other people.
In other words, it happened, it didn't go away, and now it appears that there is a market for historical retrospectives. Unless you're one of those who thinks that it was all one big "mistake" that was motivated by The Forces Of Evil, there's nothing to be upset about other than...live is moving on, as it always does.