To replace it you might need Kahn Academy, 2 years in the army, Tinder and some sort of coming of age ceremony with body paint and singing.
If we're limiting the question to "can he get a job doing this" you might be able to answer it more logically. But I'd be hesitant to take an average 17 year old and recommend they spend 2 or 4 years studying independently over the internet. Too solipsistic.
IMO, if online learning is to be a replacement for college, it needs to be a part of something more.. more.
I could imagine a setup including 25 students and a professor-coach, for example. Some sort of context.
^All that said, the US system seems nut.