deadzone, you must be aware that most longtime property owners whose properties are along the CA coast don’t have to sell and have never been in a position to be forced to sell!
They can hang indefinitely into their nineties (with a property mgr who is paid or unpaid). If their heirs don’t want to deal with tenants and don’t want to occupy any of the properties when they pass, THEY are free to put them on the market.
In the well-established areas, there are still a lot of “vacant” homes with furniture or the owner(s) storage inside, either which haven’t been occupied in more than a decade or are used by relatives when they come to SD for a visit. The owners are charged the baseline for utilities and their taxes are next to nothing so THEY DON’T CARE if they EVER have any rental income from it because they have very, very little carrying costs.
If you’re waiting for coastal CA RE to crash (so you can make purchase(s) yourself?) you may be waiting a lo-o-o-ong time, IMO.