Will Wilkinson nicely sums up one response to those who argue that out of jurisdiction movers will destroy the neighborhoodculture:

[O]pponents of liberal migration and labor policies too often confuse dynamic cultural change for cultural erosion. I more afraid that fat, tenured Americans will become too risk averse and insurance-minded than that hungry, entrepreneurial new entrants will undermine the very institutions they came to benefit from. Why not think that, on the one hand, our institutions transform newcomers culturally more than they transform our institutions, while, on the other hand, newcomers keep our institutions vital and growth-minded, rather than moribund and insurance-mided?