Charles,
I would argue with your statement that 18 year old high school students can't handle online. In fact there is a nationwide push for online education in K-12. Florida for example requires online options for K-12 students. A whole new generation of students will be coming out of ONLINE public K-12 schools in the near future. Students in traditional K-12 schools are also using online tools such as Edmoto, Ning, Moodle, Skype and others and are certainly use to the tools and resources.
Herbert Brown III