Abba, you really should consider a career in writing fantasy novels. In your long winded, complicated scare scenarios, you have yet to address three points:
1. A majority of the students in the courtesy zone probably live less than a mile from school, not rwo and a half, and don’t need budding.
2. How do yeshiva kids manage to get to shul, friends on Shabbos without a bus? Walking perhaps?
3. Do they not teach English in the private schools? Unless they are also illegal immigrants, why would they need private placement for instruction in Yiddish?