Here's the part nobody wants to talk about:
If participating in a college lecture live and via Podcast produces the same result, your professor is a dud and, you're paying wayyyy to much for your college education. I had way too many classed in my way overpriced college education that I could have picked up via Podcast and probably been better for it.
Part of the whole Podcasting kills the middleman thing is that a lot of middlemen are going to be identified for the frauds that they are.
Content is truly King and Podcasting will put some new people on the throne.