Without Prop 13, homeowners would support the construction of multifamily housing in their communities, and that would keep property taxes low for everybody (not just dynastic families) and home prices affordable. Just like things were before Prop 13.
NIMBYs would all of a sudden want more housing to be built? 100% delusional.
Nothing would change except homeowners would get crushed by property taxes and especially given the horrific income inequality in California, all the middle and lower income families would get destroyed.
Thank God for Prop 13, it's the last vestige of income equality for Californians.