The notion that online education will supplant face-to-face education is rather a pipe dream. Why do the hard sciences have conferences? Trust me, it's not for the lavish coffee and donuts. It's not for the high-end dormitory accommodations.
The point of conferences is that they make possible the sort of face to face back and forth that allows the core of a difficult idea to be conveyed in the best interactive learning mode there is: face to face, eye to eye.
The same goes for classes. Advanced classes in the hard sciences are reasonably small. There is opportunity for that same broad-channel face-to-face interactive communication that professionals rely on as part of their own learning. There's more to science than just mass of facts.