> at will employment with school district

This is thorny, because it gets into the problems tenure was created to combat: school administration's goals aren't always student success.

Especially now, they can be myopically assessment-focused or political.

Subordinating teachers to the whim of administration wouldn't help this. Jury-of-their-peers is slightly better, but has its own issues.

school boards are (and should be) elected positions. So theoretically they are accountable to parents.

Parents definitely shouldn't be the primary source of authority.

If you want to know how badly otherwise seemingly mature adults can behave, come to a local school board meeting in Florida.

"For the kids" + average parent = asshole with no holds barred