Where do you live? Plenty of private schools near me.
And every family that sends their kids to one of those private schools is still obligated by law to fund the public institutions. Furthermore, the curriculum of those private schools is still dictated by the government. The government maintains a coercive monopoly on the education business and some day we'll bust it wide open and effect a separation of school and state. Until then, our country will continue its descent into communism.