For some students, taking online high school courses is there only option. They might be too far from a school, prevented from coming to school because of health problems or restricted from coming to school because of behavior problems. I think for the vast majority of students, being in the classroom and around their peers is the best option. But for those who must take classes online the technology is improving rapidly.
I think that we will see a revolution in online learning in the future. It will reduce costs and remove barriers to open up the gift of education to all, not just those who can shift their entire lives to accommodate their schooling. Online high school will get more and more common.