I'd tend to agree with you. But the problem of teaching it still remains. While it'd be great for dedicated teachers at each school to create a flexible, Javascript-based curriculum built around online courses and projects, I think the reality is that very few would have the time, energy, or motivation to do so. So far as I know, there don't exist very many Javascript textbooks aimed at the high school, middle school, and (hopefully) elementary school levels. Without that kind of traditional material, it's difficult for even passionate teachers to get classes approved by administrators.