Eh, let's take their word for it: >But I’d like to see new homes sold at prices I could conceivably afford.

Doesn't gentrification happen not from spontaneous combos of zoning rules but when someone with money wants to live somewhere, so they do? It's part of the golden rule: he with the gold makes all the rules, unless you can go asymmetric economic warfare and fire back with zoning & NIMBY laws.