Not all students arrive on the first day of classes with the same skills sets, learning habits, comfort levels, maturity, etc. So channelling them all into a single type of learning environment, be it big group lectures, on-line lectures, on-line...

People learn very efficiently when they are engaged in a project and they find they need to understand something to make progress -- the learning is much more efficient than when someone is told to learn something because they might need it someday....

Educational experiences, 2020:

Laboratory classes continue as at present on campus. All courses employ a mix of in-person classes and online lectures and homework, but with fewer in-person classes. So, many fewer professors and teaching...

Right now, the idea of MOOCs and distance learning is the new hotness. I've seen many people (here and in the media at large) blithely assert that MOOCs, in an edX / Khan / Coursera style, can replace traditional pedagogy. That claim is dubious...