Spot on. A quick search reviews many a math teacher concerned, not exactly with Khan Academy, but the way it's being promoted. http://fnoschese.wordpress.com/2011/05/10/khan-academy-my-fi... Also, while it may be okay for diletant learning, it may not work so well for strict classroom curriculum. http://localtechrepair.blogspot.com/2011/10/cheating-khan-ac... FTR, I liked the French Revolution videos.
It will need some work revamping and may take years but I think the "flipping" of a classroom is the direction we are headed in. I love the idea of tutorials at home and one on one with a teacher in classroom. btw, my wife is a doctor and did the majority of her lectures in first year med school from home. It was great, she would even speed up the playback so that a 1 hour lecture only took 40 minutes. Many professors pushed back against allowing this. No one likes change, especially when it impacts your ego.