The manufacturers will take liability. Mercedes-Benz is already doing this with their Drive Pilot level 3 autonomous vehicles. Coverage is limited but will expand.
>DRIVE PILOT can be activated in heavy traffic jams at a speed of 40 MPH or less on a pre-defined freeway network approved by Mercedes-Benz. DRIVE PILOT operates in daytime lighting conditions when inclement weather is not present and in areas where there is not a construction zone. Please refer to the Operator’s Manual for a full list of conditions required for DRIVE PILOT.
Meanwhile, if you have contract with more serious company, you wont have to spend years and thousands fighting them over liability.