Also, keep in mind that it takes at least 3 years, if not a half-decade or longer, for a brand new automobile to be designed, tested and manufactured from the ground up. For fully autonomous cars, or even vehicles that can shift into a truly self-driving mode, to reach the market by 2020, they should already be in development, right now. And if that were the case, no amount of secrecy would prevent the inevitable leaks. There are half-measures and half-steps from the likes of Mercedes-Benz and Volvo, but nothing that makes the leap from advanced cruise control-like features to true autonomous driving. If it existed, in any form, we would know about the world's first commercial robo-car. There's no other evidence necessary that autonomous cars are further off than Musk, and much of the media, would like you to believe. Remember, it's in the best interest of everyone involved to keep you, the customer, in a state of perpetual anticipation. But you can believe in the hope of robot cars, without buying into the near-term hype.