I never really felt the Harvard focus. I've taken at least MIT and Harvard courses on it. Maybe others (not really sure what has been Coursera and which EdX). Probably the biggest issue for me is a general one with MOOCs. They mostly solve for something which really isn't that much of a problem (broadcasting a video). Other things not so much.
My experience over the past nine months is that there are a lot of platforms with work pretty well with experience facilitators for a modest-sized group. And nothing that is really very satisfactory for interactivity at scale, especially with a heterogeneous audience (except in the most glancing way like poll questions).
I used to do research on how students use educational technology, like video lectures, in moocs. So I guess I'm probably biased because I know a lot of the edx people and some of the behind the scenes stuff.
I agree that interactivity at scale is super difficult. The problem is that in a course you are teaching more or less solved problems to bring students up to speed to where the field is. So the same questions get asked from class to class and group to group. There's the idea that you can compile all this knowledge and questions and then provide that as a resource to students. But actually the hardship of getting through those questions, even though they are the same, is how they learn. So the resources are nice for instructors but not as useful for students directly. There's definitely a lot of space for innovation but most of the people doing that either lack the technical expertise of developers etc because they come from education departments or they lack the ___domain knowledge of education research. There's a somewhat large space to fill with people who are good at both.
My experience over the past nine months is that there are a lot of platforms with work pretty well with experience facilitators for a modest-sized group. And nothing that is really very satisfactory for interactivity at scale, especially with a heterogeneous audience (except in the most glancing way like poll questions).