It'll be interesting to see how these prices change when they are no longer subsidized by venture capitalists, contractor drivers, and society at large.

And even more interesting once we have decent self-driving technology. That removes the constraint -- the driver -- that makes public transit and mass transit nearly synonymous. The Personal Rapid Transit crowd has been pushing toward that for years: https://en.wikipedia.org/wiki/Personal_rapid_transit

And if cities do it right, PRT will have a big advantage over Uber, et al: they can reshape cities to accommodate the early stages of self-driving vehicles. Special lanes, limited-access roads, designated stopping points. Functioning PRT could arrive years ahead of autonomous taxis.