> Massive Open Online Courses won’t replace college. It may be part of the puzzle, but there is no replacement for having peers and mentors to go to and ask questions.

You can have peers and mentors to go to and ask questions online just as well as you can in real life. Better, in fact, since your pool of mentors and peers is much larger. Take the programming industry. If you have questions about a particular programming concept, library, language, framework, etc. you can easily find a dedicated, knowledgeable group to bounce questions off. There's no reason why this couldn't work in other fields.