yes, it tells us that human cab drivers are prohibitively expensive. robot drivers don't need to paid by the hour though. the real disruption to your car isn't a ride-hailing app on your phone. it's robot driven cars. ride hailing apps are necessary piece of predecessor infrastructure for that transportation model. it's the beginning of it, not the end.
The landscape of the future is car manufacturers offering their own "Uber" like service and that service replacing the traditional ownership model. That doesn't mean Uber doesn't have a place before then though. Like good little capitalists, the VC's will cash out and make a ton of money while the real innovation and lasting impact happens elsewhere. So, yeah, Uber should blow up when self-driving cars become a thing but they'll eventually fade away. Unfortunately, that won't be for a long time.
EDIT: Oh, and yeah, people are also going to still be buying a shitload still anyway.
Expect an even bigger fund raise where they hope some other idiots, with even deeper pockets, will keep picking up the tab.
That being said, for Uber to win the self driving car race they have to beat Google, Apple, Tesla, Didi and the automotive incumbents as Sarah Lacy has been pointing out for at least 12 months.
Uber doesn't lock in customers or create any switching pain whatsoever so their current customer base doesn't given them much of an advantage. Their software is slick and robust but it's not so technically advanced that a competitor couldn't create their own ride-calling and dispatch system (as evidenced by Lyft).
I wouldn't hold my breath that any auto maker besides Tesla could compete with Uber.
usage data. they know where people that use their app actually go on a daily basis, and how much they're willing to pay for that service.
...which is exactly what cabs are. In major cities cabs exist because it's cheaper and easier to hire a cab than to drive yourself. That cabs only really exist in densely populated urban areas should tell us something about the economics of this business model.