I want to believe in this, but I can't help feeling cynical--likening the results with that of privatization of prisons in the US.
Red-Light Cameras that infest my city were sold to public by claiming they would increase public safety, but instead are just another way for the city to generate revenue, much of which likely goes back to the camera builders.
It's hard to imagine a very for-profit entity like YC having an impact on city planning without ultimately driving towards a monetary return on investment.