If any school district cares, all the kids will essentially end up repeating a grade. This is not the end of the world. If anything, it might improve student achievement. (Students who are born right after the cutoff for a particular elementary school class, in aggregate, outperform the ones born just before, the youngest in the class.)
Outside of college-bound seniors — a special case — the main price is their time, same as anyone else, and their caregivers' time.
1) there's no way parents will be OK with this, and
2) the count of districts ready to have a 7.7% student headcount increase in one year (you're doing this for 13 grades at once, plus have another coming in) on top of whatever growth they already expected approaches zero. I mean, hell, think of what that would do to the teacher labor market alone if even 10% of districts all did that, putting aside things like building space and bussing.
You don't understand how urban school districts work if you think you can just get a grade to "repeat itself." Kids will drop out once they're 18 like flies.
If any school district cares, all the kids will essentially end up repeating a grade. This is not the end of the world. If anything, it might improve student achievement. (Students who are born right after the cutoff for a particular elementary school class, in aggregate, outperform the ones born just before, the youngest in the class.)
Outside of college-bound seniors — a special case — the main price is their time, same as anyone else, and their caregivers' time.