I think Mooh has it right when he says,"If we are to encourage students to play music we must accommodate their tastes."

I have run across too many music students who had bad instructional experiences because their teacher used their position to impose their own musical tastes. These teachers don't understand that most people want to learn to play a particular sort of music because they want to be a part of the community that listens to it.

As people get older, they tend to recognize that there are broader, more diverse communities out there, that they want to be a part of.
As music teachers, our challenge is to give them skills that they can build on.