It's interesting that the final wage comes out to around exactly what minimum wage is. Market forces at work? Driving for UberX isn't exactly a skilled job, and there are enough people with driver's licenses out there that there will always be enough supply of labor (unlike, say, software engineers).
Basically, Uber is paying minimum wage not really any different than Walmart, which is around what you'd expect for a low skill profession. And it's hard to say if the Uber drivers can even unionize effectively to capture more of the profits, because there's always so many potential scabs in the wings.
The only real solution here is a higher minimum wage, which would filter through to UberX driver earnings through market forces.