I'm almost finished with Picketty's Capital in the 21st Century, and Prop 13 seems to be a godsend for rentiers seeking the inequality of 1900-1910.
Overturning Prop 13 isn't realistic since voters are selfish. Prop 13 has GOT to be the biggest reason behind NIMBY-ism. If the little old lady in the 3 bedroom $2M house had to pay $20K a year in taxes, she'd have sold a long time ago. But because of Prop 13, her taxes are likely less than $1K a year.
But the sick thing about Prop 13 is that it applies to landlords. You know why LA is filled with all these single-story rental properties from the 70s in prime locations? Because the taxes hardly budge, so they're paying about $1 per year per square foot in taxes. Even if they sold for the huge premium, it'd be impossible to re-invest that money into something with a higher rate of return.
It also applies to businesses. It's why you see a lot of car washes making < $1M/year sitting on land worth $20M.
We could potentially modify Prop 13 to eliminate the benefits for rental properties and have the benefits only apply to the first $1M of real estate. That'd only affect the top 5%, and only marginally.
But it could eliminate a lot of NIMBYism, I think.