Taxi drivers have lobbied for years to build up the kind of economic protections they have from disappearing margins in a competitive marketplace, and consequently being a taxi driver meant you could make a middle class living without tortuous hours.
Uber comes along and operates without the limitations of those protections and drivers earn less. Ultimately without intervention it puts a whole industry of people on a trajectory towards poverty, and this is before we even get to self driving cars.
What are we going to do with everyone who gets forced out of their middle class jobs?