The thinking about MOOCs and their success metrics is flawed. We wouldn't measure the success of Wikipedia by the percentage of people who've read an entire Wiki article top to bottom for a particular topic they've searched for, why would we expect the same for MOOC courses? The reality is that it's just a great social good that these courses are available online and accessible to the select few who should choose to fully utilize them.

Everyone's too fixated on the completion rates for these courses. The reality is that the people who are checking out these courses are doing it mostly out of intellectual curiosity at this point, so they have no reason to finish certificates, or finish courses, or watch lectures that they're not interested in. These people have no incentive other than to pick and choose, and to idealistically expect that people will put themselves through the downsides of education (HW, exams, watching the boring lectures when they can just pick the interesting lectures) is unrealistic, and certainly not an indication that "MOOCs have failed."