If you think developers well build housing that is affordable for the average American once zoning laws are changed, I have a bridge to nowhere to sale you. Zoning is an issue but there needs to be a counter balance of none profit based housing. Many modern nations have already switched the bulk of their housing to the nonprofit model and it works! Once zoning is changed Best case scenario is apartment buildings with rent no one can afford. We need more home owners in America. But the whole industry is focused on building rental properties.