[Daishiman]

Honestly, even if you're a mediocre negotiator one should be quite capable of maintaining at least an IC's Bay Area salary while going remote.

The possibility of quitting if you already have extensive relations with the company is unlikely to be appealing.

Good talent is global nowadays and the arguments about cost of living are pretty much worthless if you've demonstrated sufficient value.

In the very worst of cases, OP should negotiate increased vacation time if you're going to accept a lower salary, given that it may align with OPs personal interests in this case.