It creates a downward cycle. Not enough to properly pay teachers, so you don't get the better teachers or get to retain teachers in the profession. Quality of education goes down, so families look for other choices. Public school loses money, rinse, repeat.That’s only a problem if you think lack of funds is the biggest problem of public education.
The best way to have quality teaching candidates is for them to be paid competitively.
School choice, implemented in most states by white, conservatives were an attack on large urban public schools. As charter schools filled the void, those pushing school choice have figured out they can make money on it.