I never thought about that - but I did know there were vouchers given in some large cities. But that is not like giving vouchers to thousands or millions of children to flock to private schools. If the intent was, as some see it or want to see it, that any and all children would be allowed to leave public school, there would be no more public schools and not enough private schools. Well, in will come private corporations to build private schools and if they should over-build or not please the parents, campaign contributions would make sure there were enough children 'directed' to those schools.
It is not going to be a simple - everyone gets a chance - it will be totally controlled by the government. As I said, anyone who thinks it will be hasn't paid any attention to our government and the way it 'helps' people.