There's no more space for more single family homes anyway there, so that's not even an option. What IS an option is changing mandatory single family home areas

There's no more space for more single family homes anyway there, so that's not even an option. What IS an option is changing mandatory single family home areas to allow for "missing middle" housing, thereby reducing economic segregation currently present on most of the residential land. A lot of people prefer the current level of segregation, though, so it's a hard sell.