I think this emphasis on completion rates are a problem. I take a lot of MOOCs, but not all the content in said MOOCs are important. I just watch the parts of courses that are important or relevant to what I am doing, and call it a day. For people learning from non-conventional sources, they are used to using bits and pieces from different online sources and building up their own courses and their own paths. This fas…
Perhaps they need a box on the signup or viewing form, to indicate "just checking it out to see if I'm interested", or "just here to watch part of the course".
Here in Australia, when students finish high school and enter university it is common to hear them given the advice that it is "okay to change" after a year of your course. Get a feel for it, decide if it is actually for you, calibrate against the teaching/learning style, measure the enjoyment vs effort etc. I imagine MOOCs are starkly in contrast (provide an email address) to the complexity of signing up for a university degree.
Who knows, maybe students even form opinions by partially completing MOOCs in topics they might want to study at a tertiary institution!