Why shouldn't teachers be held accountable for results? Every other industry holds employees accountable to perform and deliver.Not a bad list of potential solutions. However, some of those are good. Some have been or are currently doing. 2 for sure aren’t feasible. Good luck with removing kids from their parents for non-physical abuse.
As far as getting rid of unions, teachers ain’t going for that. School administrations have screwed teachers with collective bargaining. I can’t imagine how bad school administrations will screw teachers without union backing.
If a teacher isn't doing their job, despite the challenges they face, maybe they need to find a new job. But that's where the union comes in and buys their loyalty.