What I want to know is, when the VC money runs out, what's the barrier to entry to this business? Right now, Uber can beat everybody on price and quality because they don't have to be profitable for a long time. But once they have to compete on price, where's their advantage? Installed user-base? Incumbents forced out of business? Many times I call for an Uber and a cab comes first and then they lose my business to t…
There is no barrier to entry. Seriously. Mobile apps? Backend infrastructure? Trivial. I take that back; the biggest barrier to entry might be a massive trove of ride data for machine learning used to predict capacity requirements. In large metro areas, you might be able to get this data in an open format, obviating the need for you to gather the data yourself (the recently FOILd New York Cab Ride data comes to mind…
And BTW, according to some uncofirmed twit[1], more than 50% of lyft rides in sf are done through lyft-line, which is a pretty new service.
To a lesser extent, user density is also related(in theory) to driver ride time, both in reducing wait time, and reducing time from call to passenger.
Also there might be a possibility they can subtly incentivize drivers to only drive for them by giving complying drivers a bit more work, or better work.
And as for your risks lists,you can paraphrase it as: the hand of god(government), a darpa scale technology(self driving cars), very well resourced competitor.
But every company is under risk from the first 2, even for businesses with a strong competitive advantage.