On Line Education - Is It Adding Value?

In the last ten years, there's just been a huge influx of people who want to make educational material on line. Where is it that on line education as it stands now, or on line explanation, i should say, where could that improve the most? I wouldn't be surprised if at some point in the future, someone who wins a fields metal says, yet, i never had that connection until i watched a three blue one broun vidi on the lake. And then i could apply to this field and it's going to happen....