Disclaimer: I work for MIT OpenCourseWare and still get annoyed that we have a ton of people who don't know about us cranking away at free course materials for the world for more than a decade! (MIT OpenCourseWare was announced in 2001.)
Who will now take the responsibility of culling the herd?
MIT OpenCourseWare (https://archive.org/details/mit_ocw) stores a copy of all the videos on its site on the Internet Archive. Currently that is 75 full video lecture courses and 17 full audio lectures courses, plus a ton of smaller one-offs and mini-series video and audio files. Over a thousand hours of teaching. I would like to think that would be something of use to the human race.