Autonomous with a requirement for a human driver doesn't sound like real progress. Title might be a little misleading.
With the trucks, you have the same person overseeing his own job, except that it'll be done safer. 1 person = 1 job (safer).
Your analogy would make more sense if the trucks were remotely supervised and 1 person could oversee several trucks via remote connection.
How long until they get there? It does not look like a huge change from the person on a wheel.
Automatic cars wouldn't be allowed at the roads in one step.