If people take their kids out of public schools and put them in private school or home school, the public schools will have to shut down. In some states, there are counties that don't have public schools. If people there can't afford private schooling the county gives them a voucher to attend a private school.
OR spend their alloted dollars on other sorts of Bravo Sierra. I understand the theory, I just don't see it happening in reality any time soon. Perhaps I'm being too myopic, however---I do live in Massachusetts, after all, the bastion of the public school system mentality.
Everyone should be able to deduct from their taxes, up to the amount spent per pupil in public school, the cost of the schooling of their choice.