Hasn't the rise of Uber and Lyft already turned it into a numbers game? I get drivers that I would consider below average all the time, and I don't have any control over which driver I get. Even when you're the one driving, you have no control over whether the car in front of you is being driven by a good driver or somebody texting who might cause an accident that endangers you. I agree that it needs to be accepted on a societal level, but if you can definitively say "self driving cars are safer than the average Uber driver," then I don't think it will be that hard of a sell. That's especially true if it results in less expensive rides in addition to lower crash rates.