At the least we will fall back to incentive/disincentive social behavior. People will supply ample friendly and unfriendly advice to try to unwind the knot.
Waymo should lose their operating license based on this experience. It's self-evidently dangerous to everyone to be incapable of basic iteration. There's a whole set of law driver's are supposed to follow for handling failed traffic lights. Why have lower expectations of an anonymous car than a human?