As someone who teaches at the college level, you make an excellent point, although somewhat inverted. It's the failure at the K-12 level that produces deficient college students. Anything that improves K-12 education will only help college level education. Parents who home school are generally highly motivated and transfer that motivation to their children students. The quickest way to destroy a student's future is to leave them in a deficient traditional school and I've found some of my best and most motivated students were home schooled.