A whole new school?
Looking at the stats from the OpenStudy groups linked to MIT OpenCourseWare, I see there are ~12,000 unique registrants, and about ~18,000 “participants” in group discussions (meaning each individual on average participates in 1.5 groups).
MIT itself has ~10,000 students. Working with OpenStudy, we’ve created a free, peer-facilitated, non-credit learning community on the scale of the Institute itself. Too bad that–with the notable exception of iLabs–we don’t have the capacity to share facilities as widely as educational content.