I think Glass is heavily overrated, as are most of the so-called minimalists. Riley's original idea was great, but only few created soemting really substantial out of it.
I think even Reich is overrated - some well-trained jazz ensemble given the appropriate rules could improvise something like his works with little problems.
Except that improvising minimalism, it wouldn't sound like Jazz any more.
I heard one of Braxton's minimal classical pieces once. Big ensemble toots on one note for a long period of time. Not Jazz...not even Ghost Trance music...he's awful at minimalism.