That's not what is happening. There are multiple cases in many states of teacher education programs not being able to fill their classes. There is a lot of evidence to show that you are wrong and it is directly related to how they are treated.
Hell, it just doesn't make any sense to spend 100k and 4+ years getting trained just to go out and make 35k a year. That alone is keeping people from entering the field, certainly the best and brightest that the field should be attracting.
Yeah, I'm sure the counties will stubbornly refuse to raise salaries until the last teacher leaves the building.
Get freaking real, please.