> we'll likely see numerous other competitors emerge to compete on price
I've been beating this drum for years. One interesting point is that competitors aren't only competing on price, and there are a lot of ways to cut into Uber's market. Juno [1] offers an example that focused on a tight geography (Manhattan), and became popular by paying drivers more, scooping the highest rated drivers from Uber, and offering consumers a perceived better experience. Expect this to increase as people become more used to hailing cars from inside of their maps applications which act as aggregators.
In places like Germany where the laws make it hard for Uber to operate, smaller companies like MyTaxi offer ride-hailing services to the traditional taxi network. Their valuation likely offers a very different idea of how much of the surplus offered by ride-hailing apps can ultimately be captured by apps.
[1] Acquired earlier this year by the VW-funded Gett - https://techcrunch.com/2017/04/26/on-demand-ride-service-get...
[2] https://de.mytaxi.com/index.html