I'm not saying that the job won't be automated eventually, but the actual driving is only a part of the job. And even when the automation begins to happen, I think there will be time for them to transition into new roles.
Long haul trucks are loading dock to loading dock, so you don't need the driver to do loading.
Uber is another fleet: they just want to do transport-as-a-service so they HATE drivers as overhead. They have signed up to buy 100,000 Mercedes (future autonomous upgrade). They've indicated interest in 500,000 Teslas.
http://www.roadandtrack.com/car-culture/news/a28508/uber-ord...
http://www.autoblog.com/2015/07/08/uber-tesla-self-driving-c...
I cringe when ever I hear Programmers left of out of the, "Where will these people go." Guys like Willie Brown are alwready wondering what San Francisco is going to do with the new homeless that will be hitting the streets--when this current bubble ends.
Yes, the Rock Star Programmers will always have a job, but that's a minority of you.