A lot of VC funding that used to go to "tech" companies is now going into much less profitable types of businesses that should not be considered "tech". Businesses that most VC's don't really have a lot of experience with.
For example, their investments in Soylent, Walker and Co, Dollar Shave Club. It is REALLY hard to make money in these types of businesses when compared to software. They could be in for a rude awakening...
By the time that happens, Uber will be as big as google. They will find a way - when lot of smart people work together, they generally do.
Uber doesn't have a monopoly on smart people. Pretty soon each and every significant market in the world will have a local competitor who'll know how to play the local system better than Uber and not to piss off civic stakeholders to this extent. There's nothing to stop the competition either. Drivers already on the road with Uber can be easily persuaded to install a second app with a small financial incentive. It's absolutely a commodity play for them. Same for consumers. It's a classic race to the bottom competitive situation, great for consumers and perhaps even the drivers but not necessarily for the company.
It's a brave new world.