MOOCs, facilitation, and sustainability

Just before my Athabasca semester starts I am trying to make headway in my Pocket 'to read' collection :-). I had bookmarked this post by David Hopkins a while back where he asks for information about facilitation in MOOCs, and to some extent this runs into sustainability - something we briefly talked about in 2012 at UMass Boston when we hosted the MOOC sustainability symposium. In any case, the questions that David asks are interesting and important to consider, and I've been thinking about them on-and-off since I read his post, so here are some rudimentary, preliminary, working-thoughts. I should say that I am speaking more as an instructional designer and long-time MOOC follower, and not as someone who has developed and ran their own MOOCs. What are your thoughts on how we manage the course, the comments and discussion during the run, and the subsequent comments and discussion during re-runs? I think that the answer to this really depends on your philosophical s...