The real question is which approach is going to succeed, Tesla's partial sensor package, or Google's 360 sensor package.
Google relies on a highly expensive complex remote-sensing system called Lidar, which the website 9to5google.com explains as an "array on top of the vehicle, which — in simple terms — measures distance by pointing lasers at targets surrounding the car and analyzing the light that's reflected."
Musk late last year suggested in a press conference that Lidar was a bit excessive for an automobile:
"For full autonomy you'd obviously need 360-degree cameras, you'd need probably redundant forward cameras, you'd need redundant computing hardware, and then redundant motors and a steering rack. ... That said, I don't think you need Lidar. I think you can do this all with passive optical and then with maybe one forward radar."
Tesla's Autopilot relies on a combination of "cameras, radar, ultrasonic sensors and data automatically steer down the highway, change lanes, and adjust speed in response to traffic," and uses auto braking technology by Israeli company Mobileye.
If it's Google's, then the only people who get robot cars are the rich and the corporate/transport entities. This could cause similar issues as the nuclear industry. We try to be so redundant and safe that nobody buys it.