How could that ever work? The "unusual circumstances" that matter will usually require either action in less than a second, like an improvised detour sign, or situational awareness, like a human directing traffic around some random obstacle. At best, Google will be making cars that pull over to the shoulder and call for help in a few years.

Airport parking/shuttle service. They could even augment the AI by using markers in the roadways. That's about as autonomous as we're going to get in the next decade.

And don't doubt that Elon/Tesla use this to their fullest advantage.