I'd be happy to see all those consitutional provisions repealed. Nobody is "entitled" to anything that involves forcible taking of someone else's property.
But given the reality of innocent children with parents who are irresponsible enough to have children when they can't afford to support them (including paying for school), or parents who don't give a crap about their children's futures and spend all their money on booze or vacations or cars, I expect virtually all local communities would choose to set up some system to make sure these children get educated.
Those types of parents are not seeing that their kids get an education even today, with all the welfare and gov't provided support. Seat time is not education.
You'll always have dregs in society. Why drag the rest of society down to the lowest level just because there are a percentage at that level ? Why not end the charade of educating those who don't want it/don't appreciate it, and set the standards higher for those who will work at getting an education ?
If education was cheap, and it had value in the eyes of society, even the dregs and the children of dregs might be motivated to try.
You don't appreciate what you get for free nearly as much as something you have to work for. Think the "Law of the Commons".