I think that runs into the issue of how many are hoping to go to college on athletic scholarships. A year away from competition makes it hard to be recruited and would put someone far behind competition wise. I know academics are the primary concern, but there are a lot of people who mostly do what they have to in the classroom to get to play.
The article indicated that interest in soccer among kids in New Jersey isn't declining -- they're just migrating to private training programs and traveling club teams instead of playing in high school.