ybc, I see what you’re saying. You’re right about prop 13 discouraging mobility, I seriously thought about property tax implications when I sold my house. It is also one of many reasons I am renting and waiting for prices to fall. I’d much rather have a higher mortgage interest rate, with a lower sales price and lower property tax base.
As far as your solution, I like it! I think they are considering something like that in Idaho, because so many of the expensive homes are second / vacation, and they have had a lot of speculative buying from newly rich Californians. Limiting property tax increases on primary residence only seems very workable, even with the likely fraud that would result.