[barryfandango]

I'm currently halfway through "Introduction to Improvisation" on Coursera, offered through Berklee college and taught by the great Gary Burton.

The enrollment is around 39,000 and I'm sure the completion will be low. People worldwide and of all skill levels are welcome to ignore the prerequisite guidelines and there's no cost to sign up. I bet twenty thousand didn't make it past week one - either discovering how difficult the class is, or losing interest since they only signed up on a whim anyway. This low barrier to entry probably inflates enrollment considerably compared to a traditional school.

There is a human element you did not address in your article. The discussion forum for the class is very active and full of enthusiastic students helping each other, asking questions, sharing resources, posting recordings of their music work, providing suggestions to the Coursera staff about curriculum improvements (many of which have been implemented already.) So it's not all robots.