>Eventually there will be self-driving cars, and there's no special reason to think that Uber will be the best at building them, or that its dominant position in the ride-hailing-app space will protect it from better self-driving-car businesses.
Which also needs to factor in Uber's biggest liability: their attitude towards flouting laws and regulations. It worked okay for the ride-sharing markets, as municipal regulations are varied and slow to catch up, but they were forced to stop their self-driving car project after just a week because they didn't even get the necessary permits. [3]
[1] https://www.bloomberg.com/view/articles/2017-01-10/bank-bloc...
[2] http://www.vox.com/new-money/2017/1/9/14194202/uber-lost-22-...
[3] https://www.nytimes.com/2016/12/21/technology/san-francisco-...
edit: also, im pretty sure google pay him big money.