I just have less faith in people than Elon does, I guess. I can forsee a fun game for teenagers, playng chicken with driverless Teslas they see approaching from the opposite direction, seeing how far they can get them to jump into the ditch to avoid a collision, or herding the Tesla around in a parking lot like a game of Pacman.
I don't think autonomous driving will work until cars are networked and communicate with each other, knowing what each vehicle will do because they are in control of the whole mess. And that certainly won't happen in my lifetime. And that's fine with me.
I saw a post a while back about someone doing a milder form of that already with the Google cars. If they found one in the left lane driving too slow and blocking them in, they found they could "aggressively tailgate" it and get it to speed up so they could get around. People will figure out tricks for Teslas as well, I am sure.