Selling a dollar for 90 cents isn't revolutionary. Anyone can serve millions of customers when you operate out of the bounds of what's normally required for a business.
This ironically shows how size matters a lot. Be it state investment or huge VC, more cash, more power and more centralization means better service (if the megamoney was spent well).
I agree that Uber's way of underpaying drivers is not scalable (basic mathematics) and price hikes should happen to make the numbers work out. However the service level now people expect is very much innovative.