"In effect, the housing affordability crunch in metro New York is a windfall for nearby areas like Allentown
As someone who lives in northeast PA, believe me, it's no windfall. These people bring the low morals and incivility that NYC is famous for, with them.
We should build a wall at the New York border.
We've experienced a reverse migration from NYC over the last 20 years, which brings the sort of stuff you mention. The worse being grafitti.