ZD: What you suggest is narishkeit and impractical. It would cost the Board of Ed much more to have the same bus route drop off children at multiple different schools. Furthermore, the boys and girls schools have different hours. The boys come earlier for shachris and leave later. And if there are some boys and girls schools that have the same hours, if the Board tried mixing the boys and girls schools will change their hours to make it impossible to mix the students.
gavra: If the district runs out of money, and the State offers none, it will be the black and hispanic public school parents running to the State begging for money to restore all the gutted non-mandatory classes, leaving the public schools with a skeleton curriculum of mandatory-only courses and hours.