I agree with some of the thoughts of the author on this topics, but some of the value of the Khan Academy comes in the use of video and private study as an opportunity for students to learn. Some students thrive in a classroom with lots of other students, others do not. The use of video allows some students to pause, stop, rewind and take copious amounts of notes without the potential ridicule of classmates. It also lets teaches that may be great lesson planners or one-on-one teachers and not good lecturers have the very best provide the lectures, letting them focus where they might be better suited.
While Re. Hoekstra may not have said the right thing, it doesn't mean that he is "twitter-clueless." He personalizes his tweets, speaks to his constituents and keeps everyone informed. He isn't using twitter as a conversation yet - but that doesn't mean he is clueless either.
Did he say the wrong thing? Absolutely. But, Biden has said some stupid things too - doesn't mean he doesn't understand oratory.
Forget the class, find the best teacher. (Just reiterating what people are saying here) My best class was Entrepreneurship II, just because the teacher was great and taught from personal experiences.