It seems you didn't understand that "livery drivers" are taxicab drivers, not all professional drivers. Here's a chart showing the most common job in every state as of 2014:
Note again, livery driver != truck driver, although they'll be affected, too. Over 3-million Americans are employed as drivers in some capacity (trucks, buses, delivery, cabs etc.). There are plenty of other employment categories that could also be automated away.
Where did I say anyone has a "right" to be comfortable? I'm pointing out that it's a bad idea to yank the rug out from under them (really from under anyone) and give them a hard landing instead of easing them into a soft one. Especially when you're talking about the most common job in approx. half the states in the union (and one with an average annual salary that allows little room for a 6-12 month rainy day fund for a storm that might never end).
If you'd asked me two years ago, I would have agreed. However, in the last year I've seen: Uber bunging self-driving cars on the streets in defiance of government regulation; Alphabet and Tesla and lots of other companies giving demonstrations of impressive technology; and old-line manufacturers champing at the bit to get in on the game.
True, there are still serious failures, but not as many as one might expect for such a young technology. A difficult hurdle like the "snow problem," for example, isn't operative on major highways and in warm-weather states. It won't be an instant shift, but things are accelerating rapidly and existing legal and social structures are ill-equipped to handle it (in no small part due to short-sightedness and lack of empathy on the part of the establishment of both duopoly parties as well as Libertarians).