Just drive down Bedford Ave Area
I’ve been to Bedford Ave. in Brooklyn for a Chassunah and don’t remember seeing anything like that. Mostly small apartment buildings, IIRC.
I would like to know how you can force people to stop spending money on vacations that you deem execessive to give the money to yeshivas?
No one will force anyone. Once the schools send out notices that they are closing, people will prioritize spending (in exchange for control of the school from the principal), and the school will not close.