I see uber as a giant bulldozer that is paving the way for future competitors. Once they realize there's no way to keep people locked in unless they form a cartel like the traditional taxi industry, investors will panick.
An Uber cartel is the least possible outcome because they do not own the roads, the car, the people. Do I ride the bike to work or hitch a ride? Do I use Uber or just take a taxi that's parked right across my building? Do I use Lyft or Uber if Lyft is offering cheaper ride? Is there any noticeable difference or do I even care, I just want to go from A to B and pay the least amount of money.
This is the endgame for Uber: enable future competitors to reap the returns on it's investment because they are focused on monopoly in an industry that won't make it possible.