If teachers could not be tenured and had to fight to keep their jobs due to competion then they would turn out a decent "product".
Tenure? What's tenure?
In many states, California and New York for example, after a tenuring period of 2-4 years a emplyee becomes 'tenured'. These are closed shops and teachers are union memebers. Every tried to fire a union memeber.
Arnold tried a prop to change all this (5 years instead of 2) but it failed miserably.