Uber's' innovation leads to a fleet that's easier to regulate due to constant monitoring, and pre-booking data. However, when it comes to traffic congestion, their solution is pure demand-side economics: increase prices as high as the market can bear. This means with no cap on supply, more and more cars will get put on the road to serve as part of the private fleet and it's the cities that have to bear the increased costs of road construction & maintenance.
My only hope is that rather than make cities crack down on Uber to maintain the status quo, they'll instead invest heavily in public transportation so all cities can have something on par to NYC today, and NYC tomorrow can have something on par to Tokyo.