Trent,
The term "crossover" makes me uncomfortable as well. I've long thought that the next great (or next generation of) solo trumpeter(s) would break pre-conceived barriers down and create a career that includes elements of new music, free improv, world musics, and jazz.
Markus Stockhausen comes immediately to mind, as do Peter Evans and Brian McWhorter. Many of the names on my "players to watch" thread are moving in this direction as well.
We're going to have to start a "crystal ball - where we're heading" thread here at some point, but not quite yet.
Best,
EC