If you don't do any land seizures, shouldn't the result of upzoning be more mixed levels of density, according to who sells to developers and who doesn't? I don

If you don't do any land seizures, shouldn't the result of upzoning be more mixed levels of density, according to who sells to developers and who doesn't? I don't see any scenario where SF gets "demolished" without active government redevelopment like what happened to the western addition.