I mean I'll say out loud what people are skirting around when it comes to teachers, and this is information coming directly from 2 of my close friends, both under 35, both with Masters degree's in education, both of whome have left the profession....
It's the Parents! Plain and simple. Just turn on the news and watch as parents are taking over school boards turning schools into political battlegrounds, public school teachers don't wanna deal with it anymore. Point Blank.
So the young ones who still have time to make a career out of doing something else are leaving, the ones who are old enough to collect their pension are retiring at the first available opportunity and never looking back, and schools are now composed of teachers who are 15-20 years in and have to stay to collect their pensions, with no one their to replace them.
There's nothing wrong with parents being involved in their kids schools, however parents nowadays are trying to tell teachers how to do their jobs, and teachers frankly aren't putting up with it anymore. This isn't hard to figure out