It seems like gp’s proposal is to eliminate Prop 13 literally so that people will be forced to move out or that the threat of being forced to move out will cause them to man the barricades and demand more housing to lower property values (good luck with that).

If the point is simply to raise income for the state, that’s an interesting discussion that we can chat about. But the topic is housing availability and I don’t see how this proposal would affect that with real means testing. People who can afford it won’t move and landlords will simply pass the costs on to renters.

That would be impossible to manage in practice. It would be too easy to game such a system, for example by doing a fake sale to a low-income relative.