The article doesn't really convince me that there are perils. Turns out the class where 50% of students failed was one were lots of students had already failed

The article doesn't really convince me that there are perils. Turns out the class where 50% of students failed was one were lots of students had already failed the course before, and a a major other part of the students didn't have access to a computer. Surely MOOC isn't for everyone, as it probably provides less hand holding. It's still a great resource - I have already learned a lot from such courses.