This. Self-driving risk is likely already comparable, if not significantly better, than human-driving risk, but even if it isn't, why would insurance companies care? They're the bookmakers, they don't really care which horse wins as long as they can reasonably accurately predict the odds. At worst insurance for cars with self-driving features becomes expensive.

The one thing I could see insurances worry about is correlated risk. Imagine if an accidental push installs a bad development version of the autopilot on all cars instead of the 2 test vehicles with extra sensors, causing a much higher crash rate. Add a broken auto-update mechanism preventing a rollback, and it could take a day to mitigate and a week to fully stop the crashes, and during that time a lot of cars could crash. As long as it's no worse than the crashes resulting from e.g. a day with severe weather, it'll probably be fine, but if it significantly exceeds that, insuring self-driving cars could become too unpredictable, and thus too risky for insurance companies.