Infill development and multi-family housing is the only solution that can deal with the rising problem of affordable housing. I recently met with the board of the Canadian home builders association and they need a quick turnaround time for permits, less red tape with zoning and re-zoning, subjective efficiency requirements, etc. We can't keep on saying that we have an affordable housing pandemic and then create problems i.e. Nimbyism.
Permits, zoning, and rezoning can not take more time than the actual construction. It's an economics problem. More demand and less supply will always result in unaffordable housing.