If anyone in SF is interested in helping out, I could totally use a collaborator or two if skillsets/personalities mesh well. (I'm doing all the coding right now but the project could greatly benefit from a second developer with good design sense and some web dev experience)
I'm a proponent of making education accessible, but it seems that it is fairly easy to find good resources to learn just about anything online, particularly if it is related to computing. The real problem I think is motivation. Most college students don't try that hard in school, so I wouldn't expect most people taking online courses (particularly free ones) to try that hard either.
If you're motivated enough to learn the resources are already available to you. If not, I think the efforts of others to make you learn will have marginal effects at best.
Edit: I was replying to the first point about completion rates being low. I actually think the discussion idea is a good one and would be helpful for those who actually want to learn the material.
For everyone else, I'd imagine the motivation level is higher because of voluntary enrollment than a college student's who is forced to take certain classes.
Also, the current iteration of online education can survive on unassisted self-motivation. I can't recall the specific stat, but I believe 80%+ of students taking coursera classes already have a bachelor's degree. Most classes tend to be technical, where online resources are free and plenty. And given the self-paced nature of online classes, most students who learn best in group environments are probably pre-filtered and never sign up.
Perhaps discussions would be even more relevant as online education becomes more mass-adopted? Group tutoring for home-schooled kids, KUMON classes taught online, K-12 education where students need more hand holding, liberal arts classes where answers are subjective and can't be auto-graded, etc.
Idea: Weekly online, live discussion sections to accompany self-paced video lectures. Discussion sections have 5-10 students and are facilitated by Teaching Assistants
How it works:
Students taking a MOOC course sign up each week for a discussion section. There can be multiple discussion sections to accommodate changes in the student's schedule, different time zones, etc. Students pay ~$10/discussion, once a week, for an hour.
Discussion sections can be G+ Hangout style and taught by crowdsourced Teaching Assistants. These TAs can be grad students in universities looking to make extra money. They can assist students with HW problems, go over tough concepts, and talk about material outside of the immediate subject matter.
TAs can rev share per discussion. Example: 30% rev share for a class of eight students paying $10 each --> $24 for the TA for an hour of teaching. This is significantly higher than market rate (~$10-16/hr)