Right now, the drivers are subsidizing Uber, by taking on the costs of insurance, maintenance, gas/charging (not only paying for it, but physically getting it done), phone bills, depreciation, etc. Those costs get shifted onto Uber when they buy their fleet of driverless cars. If they're losing a billion and a half dollars now while avoiding those costs, is there somehow going to be enough magic profit when the driverless future finally arrives to cover all that?
I don't know. Right now it seems they're in the magic bubble of being a "valuable company" while not producing anything nor turning a profit. I guess the question is whether they have enough cash to burn through to wait it out until the driverless future arrives. If they get this super fleet in three years, maybe they do. But if it's 10 or 20 years until the real driverless world emerges, then things don't look so rosy.