I agree with the end you have in mind, but I don't think that legal requirements should (or could) be used to make it happen. What we're talking about is inevit

I agree with the end you have in mind, but I don't think that legal requirements should (or could) be used to make it happen. What we're talking about is inevitable if we separate the government from education completely. In a free education market, parents would be free to ask a private school's administration, "What does your math teacher know about math, and what credentials does he have to prove it?"