Or their customers losing interest as driver/fare subsidies are slowly dialed back. I've already begun planning on Uber with hesitation as I have now twice been left "stranded" for ~30 minutes without an active driver available in my city.
I'm fine with the surge pricing which comes along with that but Uber is becoming increasingly unattractive to drivers and that's a real problem alongside increasing fares. Most of the casual drivers who fuelled Uber's early explosive growth are long gone now that the true costs of using your personal vehicle as a taxi became clear. Even the dedicated drivers are staying in on weekdays because Uber oversaturated the driver pool in small markets while cutting back on payouts. There aren't enough riders on a Tuesday evening for more than 1-2 drivers to dedicate their time and when those 1-2 call it a night, there's no one willing to stay up for a single $7 fare.
That's ridiculous. It's not even a little hard to imagine that they could be overtaken by a similar competitor such as Lyft given a plausible sequence of events. In fact it's basically a certainty that they would be if they ever abandoned competing based on price. Which defeats a hell of a lot of the point of paying to acquire a monopoly in the first place.
Once Uber has executed a tactical blitzkreig in a new city and incited a pogrom against the cab drivers, and fought the legislative battles with resistant city councils; the door is open for any rideshare company to glide in on Uber's coatails and take advantage of all that costly trailblazing without paying a dime.
They want to get in, and then work with the locals to establish some `sensible regulation'. Regulation that just happens to be cumbersome enough to deter new small-scale entrants.
Still there might be a political play(using million of drivers, etc) to delay the entrance of self-driving-cars until 2 competitors are about equal, and than it might be better for one company to cooperate with UBER and get some advantage than to try to go alone.