"Ola, the largest rival to Uber in India, has announced that it has raised a $400 million Series E round to fuel further expansion in India ... [It had] raised $310 million last week according to filings ..." - Jon Russell, Tech Crunch, April 15, 2015. Here is the article.
So, it could be the invisible hand of the marketplace, not regulation/litigation, in India which presents the formidable challenge to Uber. As many know, the alleged sexual assault by one of its drivers became high profile. It was also why Uber had to suspend operating there temporarily.
In Campaign 2016, conservatives can leverage this developing case study as the platform against additional regulation in the U.S.