This is the biggest problem with people who oppose Prop 13. They claim that owners "never sell", however if you look at the number of sales, there's nothing to suggest Prop 13 stops house sales. It's basically a lie, and there's no actual data to suggest that California house sales are drastically lower because of Prop 13.
California has 39,512,223 people and 441,900 homes sold in 2018. https://journal.firsttuesday.us/home-sales-volume-and-price-...
Texas has 28,995,881 people and 344,030 homes sold in 2018. https://www.prnewswire.com/news-releases/texas-housing-marke...
Florida has 21,477,737 people and 277,827 homes sold in 2018. https://www.prnewswire.com/news-releases/flas-housing-market...
New York State has 19,453,561 people and 134,066 homes sold in 2018. https://www.democratandchronicle.com/story/news/politics/alb...
I used 2018 data because I couldn't find consistent 2019 data for all those states.
California has 1 house sold for every 89 people and Texas has 1 house sold for every 84 people, Florida has 1 house sold for every 77 people and New York state had 1 house sold for every 145 people.
Per capita, the rate of housing sales in California is not so disparate compared to the other large states, so anti-Prop 13 people need to come up with real data to show how Prop 13 is actually affecting things instead of whining about how existing home owners don't pay their fair share.
There's nothing to suggest that Prop 13 has affected real estate transactions in California. And especially in the Bay Area, the amount of turnover is healthy. In my city alone, I used Redfin to calculate that about 50% of the homes changed hands over the last 10 years. That means that the property tax was getting reset to more current levels.
If you look at the property tax rate that California pays, it's higher than Florida and New York, but less than Texas. However, Texas doesn't have state income tax, so overall the taxes being paid in California are exorbitant compared to other states.