I see your point, and I don't disagree. But we're currently allowing developers to pick and choose which housing to focus on, and so the only housing being built is the housing with the most to profit from, the higher end housing.

I say mandate middle and lower income housing because it's not being built, leaving a growing population to scramble for a decreasing supply of units.

Mixed use buildings and neighborhoods are also disappearing, and mixed use buildings are going to be key in the future.