I think Uber's business model relies on self-driving cars. They're paying subsidies now to build a brand -- the name "Uber" has become synonymous with "pull out your cell phone and call for a ride" -- that will be very valuable once self-driving taxis become a commodity (which will happen shortly after their introduction). Uber is not a bet on who can build the most profitable taxi company now -- it's a bet on a bran…
Imagine if instead of becoming an uber driver, you retrofit your car with an Uber Automated Car Taxi Converter(c), "guaranteed to put your car to work for you!"