This would potentially work... if the cameras could see the places where the ultrasonic sensors were. But they can't! There are big blind spots near the bumpers. I guess they are planning to just have the car fill in the blind spots by remembering what it saw from other perspectives? But that only works when the car is moving and can't account for small obstacles that can move unpredictably, like animals or toddlers.

I'm sympathetic to the idea that it's possible to drive a car with just cameras, but the specific cameras that Tesla has aren't good enough. They need more coverage, better quality, and self-cleaning.