Remember that article yesterday about the company that resold movie tickets at a loss to gain market share? That's Uber's business model.
(Self driving cars were never going to save them. Not only do they not work yet, there's no reason to think they'd be much cheaper for years to come. Uber would have to pay for them, garage them, maintain them, operate control centers, etc. They'd be in the car rental business, which is not hugely profitable. Uber's business model is to dump their operating costs on their drivers. With self driving cars, they couldn't do that.)