I'm pro-teacher but anti-teacher's unions. The way that unions defend mediocrity pisses me off to no end. I think the demonization of teacher's unions is often over the top (bad parents and bad students are huge problems, pretending that every problem with our education system is because of bad teachers is silly) but they are still a strong negative influence.
Basically this, especially when it comes to tenure. Tenure no longer makes sense for education. (I'm waffling still about the virtues of tenure for university faculty, but I'm starting to lean against it.)
It is worth noting, though, that a loss of tenure will not bring down the price of education long term. One of the appeals of a teaching career is the perceived stability. If you take that away, the teacher supply will substantially decrease over a couple decades (as fewer people go that direction for a career), meaning that the pay required to hire teachers will go up. This will mean that education on the whole will
cost more but be higher quality. This is fine, and probably the way it should be, but fiscal conservatives must understand that tenure is a benefit along the lines of retirement or heath care, and that if they take it away they will need to replace it with pay in the long term.