On the original topic: when construction tradesmen are busy doing business in one neighborhood, once that area becomes maxed out (whether Jewish or not) they can hopefully use their expertise elsewhere as long as the economy/construction in general is still on the rise. Just as many Yidden are busy with the Brooklyn/LIC construction boom regardless of who the eventual residents are.
Slightly off topic, the Frum Yidden in Airmont just ousted the old Mayor that was behind the literal harassment Frum Jews had to put up with. It’ll be interesting to see how the neighborhood will manage to balance expansion with the quality of life Yidden moved for. (Unlike Monsey where many moved for cheap housing, I don’t think that was the main driver of the Airmont Jewish expansion.)