I took Sebastian's AI class at Stanford and signed up for more classes at Coursera (NLP, image processing). However, I think both of them lacking in student engagement and need building up additional infrastructure to keep student motivated. Self-pace study or self study requires a lot of discipline and a little bit of push via game mechanics, daily emails etc. can go a long way.

I think their metrics should not be just based on total signup or total classes offered but how many students graduate with high level competency. It's the total graduates and their skillsets that have HR value at the end.