This plus the news that Waymo is starting its autonomous ride-share service next month is a one-two punch for Uber this week. Might be one of the largest unicorns to die in our generation.
You don't get to the size they do and simply die. They'll be acquired and vertically integrated in a way that lets them be competitive on price. You can break even on the ride if you make it up in harvesting data, showing in car advertisements, having sample products placed in cars, and a million other "fremium" style revenue harvesting techniques.
From what I recall, Uber is profitable in New York and San Francisco. Uber failing would probably involve them being bought by a private equity firm and cut back to servicing those cities.