I just smile to myself when teachers rail against their dismissal. Hell, you gotta be so bad to be fired as a teacher that your hope for employment anywhere else is dim.
On The Other Hand: Speaking as one from a whole state full of "low performing" schools I have to say that the problem most of the time is the students themselves, and of course the students are driven (or not) by their parents attitude. I think it's hopeless. I don't think anyone will ever take the area that produces low performing schools and turn the school around with any regularity. Might happen once in a while, but not often.
When politicians and school boards get involved, it gets worse. Their common attitude is, "Oh, My God! The students are flunking algebra II? We've got to start teaching calculus!"

........."What?! They can't read? Teach Advanced English Literature!"