Just a thought,

I don't think the argument in the US against vouchers really has much to do with giving students state money to go elsewhere or that it will make situations uneven. The main problem people have with it is that almost every private school in the US is affiliated with a religious organization, generally the Catholic church I believe (at least most are around Cinci) and that raises the question of that wall between church and state. It's perceived by many (and not unjustifiably so) that giving students money to spend at a religious private school results in the state funding a religious organization, because obviously the funding they get isn't only spent on education.