As an example this also occurs in other areas: I probably average having a student in my classroom to work on reading or math 2 times a week after school. Its usually not their choice, I call their parents and tell them its something they need to do.
Any time we start putting a sport on the same level as math or other studies we are heading down the wrong path. Without a doubt some kids will balk at what is required of them in the classroom and there they should have no choice. Well unless we are talking about algebra, we all know they will never need that.
I also don't think wrestlers get burnt out, they get beat out.
They quit for a variety of reasons and it is far more common for the parents to get burned out at the younger ages due to tournaments running too long and not starting on time IMO.