[bobthepanda]

Local zoning decisions could probably be done given that they are not expressly enumerated in the California constitution today. Cities' current authority to do so is defined by Article XI Section 7, which just says "A county or city may make and enforce within its limits all local, police, sanitary, and other ordinances and regulations not in conflict with general laws.[1] ". Theoretically the state could just pass a general law that now conflicts with this and then localities have restrictions on zoning.

Prop 13 was passed in 1978 as a constitutional amendment, so the only way to repeal or reform that would be another amendment. The process for doing so via the legislature requires a two thirds supermajority in both houses, and then it goes to the ballot anyways. https://ballotpedia.org/California_Constitution#Amending_the...