However, if you ask me, the value of today's ride sharing networks are in the human driver network only. These companies spend tons of effort corralling humans into their apps in order to have your ass in a seat within just a few minutes.
The technology to create a ride dispatching software platform is extremely easy to crank out. I cranked one out from scratch a few months ago for a company in Africa (https://play.google.com/store/apps/details?id=com.safeboda.passenger&hl=en) in just 10 days and chronicled it here (https://hackernoon.com/how-building-lyft-helped-me-launch-a-new-ride-share-app-in-10-days-4d73b0ee1e3e)
If/when the tech for driverless comes of age, vehicle manufacturers will be able to quickly produce enough units to satisfy demand, develop an app for very low cost, and crash the value of human powered networks.
If Google releases an app & automated car, I'm going to install it. Same for Tesla. Would I want to use a 3rd party ride aggregator to save $0.50 or have it arrive a minute sooner? Not if I could ride to work in a Tesla for $3.
I say "ridesharing" in double quotes because this whole thing is obviously just taxi 2.0. A ride SHARE would be if someone joined you, as the driver, on a ride you were already going on anyway.