Having him resign won't fix anything. The big issue is that CA homeowners want their home values to be high including in high risk fire areas. But they don't want their insurance premiums to reflect their home values or wildfire risk. So the state interferes in the free market and prevents insurance companies from setting rates without the insurance commissioner's approval.
The insurance commissioner is an elected position. And, unsurprisingly, the insurance commissioner has typically denied those approvals many times. But that's starting to backfire because it doesn't make financial sense for the insurance companies so they just start leaving the state, dumping policy holders, and putting more people on the FAIR plan. None of that's going to get fixed if he resigns. A new insurance commissioner won't do any better.