The strike by Chicago teachers continues. It is a hardship for parents and one more tough break for the students in Chicago’s public schools, some 40 percent of whom drop out before graduating high school. Equally unfortunate are the 20 percent who do graduate but are still functionally illiterate. But the strike is also an opportunity for some, including Mayor Rahm Emmanuel who famously said that, in politics, you never want to let a good crisis go to waste.