People don't bring it up because it requires doing things most understand to not be options. 1 - how would you stop people from moving to SF if they choose 2 - it stops dynamism for the city. You are here because you were already here is the only requisite.

The prices going up is the market creating the incentive for less people to not move to SF and old guard to stay. You already have that. You are not going to bring down prices while limiting people without legislation that goes into dangerous territory of limiting who can live in one of Americas most dynamic cities.