I could see the shift when I was touring. I came in as a taper at the tail end of the Grateful Dead era. There was a distinct difference b/t the Phish Phans and the Deadheads. Although the Deadheads were melding into the same the thing, the Phish kids seemed to be far less community oriented and far more cool oriented.
This is a very general stereotype but the paradigm was shifting.
Jambands, now & then
A Rebuttal: A Response to "What Happened to the Jambands Community?"
Old School: the Dead
New School: Phish