Consider doctoral programs. The years up to candidacy are usually filled with coursework. Then the dissertation phase kicks in and many students never complete the research. They must manage their time, commitments, and resources with little structure other than what is self-imposed. Many ABDs out there. Are they dumb? I think some are brilliant, but they missed that structure. Perhaps they lean on it too much given most had this format during primary, secondary, higher ed.
I also believe that student interaction enriches the learning environment. We can earn a degree through self-study, but our education comes from reflection, practice, and application (including with others....at least in my view.
Would be an interesting topic to research. The current structure is ripe for change. Video learning would have helped me in school and I believe it's a great resource....along with books, practice, labs, and classroom support (not just physical, could be logical/virtual classrooms). I just don't think videos are a panacea and they will not replace traditional classrooms. Augment, perhaps.
Khan academy is not quite video learning. It is video learning, but it is free, it is done in 10 minute lessons, and all these 10 minute segments are immediately visible (thousands of them) and can be chosen by the user. Video learning of , say 10 years ago, was a cd with a video recording of a guy doing a classroom lecture.
While on the surface, they are both the same, the structure of Khan academy is much more beneficial.