From where I'm standing it seems that the "traffic chaos" is being brought about by the cab drivers, not by Uber...
I fail to see how uber's growth will cause traffic chaos.
How so?
There are about 20000 black cabs in London which make abrupt pull overs, ridiculous u-turns and blocking lanes 2 mins at a time. Luckily London drivers are familiar with how they look and can prepare ahead for erratic behaviour.
Imagine there are 100000 of them, effectively under camouflage.