Gee, Jose, I wish I had some of that stuff you've been inhaling - it must be really good. For in reality, vouchers will turn back the cloch to the pre Brown v. Board of Education era. You think our public school are now seggregated - that is, reflecting the ethnic composition of the neighborhoods (which are seggregated)? Then wait for the vouchers. There is just no fucking way to avoid that outcome if you allow parents to "freely" choose schools. Why?
Most parents have historically opposed integrated education as devil incarnate - just look at busing or why people escape to the burbs. This is not just white folks, for to my knowledge "black" or "hispanic" schools have considerable appeal to the respective subpopulations. So to make their establishments commercially attractive to the voucher-paying clients, school management would do their best to ethnically cleanse their classrooms. And it will not be that difficult - class and ethnically biased 'standardized' tests have been doing a truly wonderful job in this country for decades. And if that does not work, there will be surcharges for 'extra services' or straightforward intimidation to complete ethnic cleansing of schools. And you cannot have an affirmative action to counterbalance those trends - for school managers could truthfully say "blacks/latinos/whites choose not to enroll their kids in our school."