Rather than await a moment of silence, perhaps now is the time to carefully see what can be preserved. Somewhere in possibility-space is a model in which great minds teach in only the ways that they are well-suited to. Giving the same monologue year after year will likely die, but the teaching time that frees up could be used for some sort of mentorships or discussions or teaching of subtleties.

The first step is to characterize exactly what is lost moving from a traditional model to a Khan-academy-like model. Then to determine how to focus on those things. Then to experiment.