Regarding your point about probability of creating a monopoly:
"Brishen Rogers, an associate professor at Temple University’s Beasley School of Law who has studied Uber’s effects on the taxi market, said traditional cab companies are clearly threatened by newer competitors, and he expects many more will go out of business as a result.
[Many] lenders, including Citibank, expressed concerns about the effects that “nontraditional ride-sharing companies” would have on the city’s traditional medallion-based business model. "
http://www.wsj.com/articles/san-franciscos-biggest-taxi-oper...