Anyone who has taken a black cab should immediately understand the hypocrisy motivating this decision. The user experience is absolutely horrendous and there's no good tracking system to make black cab drivers accountable. In short, as everyone knows, it is just another artificial monopoly enshrined into law by regulators.
A good thing is that same regulators are losing lots of credibility. For decades they could pretend they were acting on basis of consumer protection. Now it is clear they aren't. People love Uber (not necessarily applies in the US anymore) because the experience is amazing at decent prices. Even in a city with a high density public transportation system like Paris, you are always happy to have that option in case it is past 1:00am or you're in a hurry.