In this video, Derek Muller (@veritasium and Veritasium on youtube) makes a video about revolutions in education. I think he's right. In the past, we have claimed new technologies would revolutionize education (films, radio, tv, the internet) but they didn't.
What about youtube? Will that revolutionize education? Maybe. Right now there many, many instructional videos on youtube (like my introductory physics videos). But will youtube videos replace the teacher? Here is a great quote from the video:
I'm not convinced that youtube will revolutionize learning, but Derek makes some great points about the learning process.