The problem IMO is believing that not completing the course is in any way actually a problem. Ala carte learning for fun and profit works for me. I'm saying what it's worth to me as well. Maybe such beliefs should be studied across the customers of Coursera and Udacity to refine their business model?

Bonus points for figuring out that I download and save a lot of lecture material for later viewing because some professors force their content to expire and go away. This stuff is gold for passing the time on transcontinental flights.

Negative points for the absolutely godawful official Coursera mobile app in an age when Coursistant is both free and 100x better. Why did they even bother with such an obvious Acqui-hire in plain sight?

Finally, if people pay $X for a fancy certificate and then don't complete the course, sometimes it really should be considered their problem, not yours. You can't save a world stuck in a infinite loop of its own making. What's the old joke? How many therapists does it take to change a light bulb? Only one, but the light bulb has to want to change.