... which is interesting, because while it demonstrates that cabs are perhaps not as damaged by Uber's business model as they claim they are, it plays into DeBlasio's arguments that Uber increases congestion.
Intuitively, I'd say Ubers spend less time driving around looking for a fare, and a more intelligent dispatching/routing model would decrease fareless miles driven. That said, if it causes a shift from subways, it would increase congestion.
I don't think this is a reason for the government to attack Uber. If traffic is a problem congestion charge type systems would be more effective, as it would 'penalize' all players equally; Uber, Taxis, and private vehicles.
Of course, there are plenty of reasons for them to attack Uber already; the contractor model, the beg-for-forgiveness model, etc.