Here in the deep South soccer is going strong at the High School level, not just among pre-teens. My son, who turns 29 this summer was an avid player throughout HS, playing in a school league for half the year and another league the other half. In fact, most of the youth in our church play soccer, not another sport. It has become a source of conflict with regular church activities, which is a sure sign it is not just some incidental sport.
I suspect it will continue to grow in popularity for the foreseeable future, and give the other sports a run for their money.