Teachers should teach, and should be in charge of instructing and evaluating teachers. Principals should run schools and administer the operations therein. These should not be controversial notions, but decades of inertia and turf wars gave us the system we have now.
In Delaware, at least they are talking about shaking up that system, and the Delaware State Education Association is supporting those efforts. I am pessimistic about its chances of becoming a nationwide trend, but every little bit helps, and the union deserves credit for moving in this direction. This article has the details , and this video explains the reasons .
Meanwhile, in Madison.