I understand why they did what they did, but it's a real shame because he was a fantastic teacher and the material on both OCW and edX was incredibly valuable. I took two of his courses on edX and both were among the best of the 10 or so courses I've done on there.

I hope another copy of them pops up. It'd be great for them not to be lost from public availability without MIT having to support it.

edit: Of course, I don't think I ever archived a copy of these edX courses (it was difficult to) but I'll check when I get home.