In other words, does Uber have a viable business model?
Some analysts think the answer is no.[1] They argue that Uber will never be able to charge prices in excess of the level required by a traditional taxi/limo operator to be profitable, for long enough to recoup the billions of dollars the company has burned by subsidizing the price of rides. Put another way, even if Uber drives every competing taxi/limo operator out of business, as soon as the company raises prices to cover costs -- vehicle, insurance, maintenance, fuel, credit card processing, license fees, and (at least for now) labor -- new entrants (and revived old entrants) would quickly come into the market, preventing Uber from keeping prices up.
[1] For example, see http://www.nakedcapitalism.com/2017/06/wheels-come-off-uber....