Problems I've noticed with Uber time estimates in the US, add traffic and it really can slow things down. -Car just passed a turn when I call it. -Car looks cl

Problems I've noticed with Uber time estimates in the US, add traffic and it really can slow things down. -Car just passed a turn when I call it. -Car looks close, but really isn't. For example, its on a highway and you are a block over. -Misread on the direction the car is traveling, usually from signal interference. Predictions, I don't know anyone at the company so this is what I expect they are doing. If they don't, a competitor will: -Within 5 years we will start having driverless Ubers. -Service can scale and they plan on it, they have taken the start at the top of market and work down. The thing that has kept me thinking is, by the time cars are driverless, will taxi cab medallions (in NYC and Hong Kong at least) go up in price because you don't need a driver, or will they be worthless?