You mean teachers will have to be good at their jobs to keep them? Who ever heard of such a novel concept?
Maybe the military, and most businesses should do something similar. 
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In the business of war, there is no invariable stategic advantage (shih) which can be relied upon at all times.
Sun-Tzu, "The Art of Warfare"
Hearing, I forget. Seeing, I remember. Writing (doing), I understand. Chinese Proverb
Too many people are looking for a magic bullet. As always, shot placement is the key. ~TR
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