If they play it smart Uber will never die, but I've seen lots of companies fail because a competitor showed up and forced them into a vicious cycle of cutting q

If they play it smart Uber will never die, but I've seen lots of companies fail because a competitor showed up and forced them into a vicious cycle of cutting quality to keep profits up, which drove out customers, etc. If the good drivers stop working for Uber because Uber is squeezing them, for example, Uber may get a reputation for having poor drivers.