I certainly does seem to me, and my teacher agrees (he is a school district trumpet teacher) that the schools here in the US basically gear kids up to play the classical reportoire. Fact is, I don't think my teacher played much jazz till he started teaching and went for a Master's (studying jazz).
As a student, I don't mind learning a lot of the classics. I'm figuring it will train me fine for most any kind of playing after I hit a certain level.....
of course, I could be wrong...
and who's got time for much else anyway. Tough call, is it diversity or watering down. I don't pretend to know. Good discussion.
gregc