Rates for human drivers are currently at the correct level for insurance companies to pay for damage and make some profit.
If autonomous cars result in less damage than humans, their insurance price will be cheaper than human drivers, but there's no reason to raise the human rate at the same time, their accident rate should stay the same.
If autonomous cars result in less damage than humans, their insurance price will be cheaper than human drivers, but there's no reason to raise the human rate at the same time, their accident rate should stay the same.