It doesn't really change my point though – I still don't see why a $2M+ property deserves to get transferred tax free. A $2M property would still only pay a little over $10,000/year in property taxes after the $1M exemption (which you can deduct against federal taxes, even with the SALT cap, which itself will likely repealed!). A pretty nice discount for an heir compared to someone who just went through actually buying a $2M home and pays twice the tax.
Honestly, if you're inheriting up to a $5M home for free in CA, and are still reliant on a job to make ends meet, the payment probably comes out to more or less what you would pay in a mortgage+taxes for a ~$1M home. A pretty good deal! If you're inheriting anything more than a $5M home, then I don't really think Prop 13 was intended for you in the first place – people with $10, $50, $100 million+ properties, well, it's my belief that we shouldn't be basing our entire housing policy on what's best for them. They can likely afford the taxes.
Not to mention that you can only shield a house from re-assessment for 1 generation, so even if there was a multi-million dollar family home that this family simply couldn't afford to pay taxes on otherwise, the heir of the heir would have to pay taxes regardless. So what's so privileged about the situation that tax reassessment gets to skip a generation? The law as is is designed to benefit a shrinking sliver of the CA population while debatably actively hurting the rest.
I think a decent compromise that won't actively pull the rug out from anyone while also leveling the playing field is just ending Prop 13-related inheritance exemptions altogether. It wasn't even part of the original law. Then get rid of the exemption for all commercial and secondary/investment properties going forward. Let people live in their primary homes with a frozen tax basis, sure, just don't let them transfer it (and for the edge case, to encourage downsizing after becoming "empty nesters", allow people to transfer their assessed tax basis to a property of lesser or equal market value).