For three summers when I was in my late teens, I worked on my grandpa's farm in western Kansas. I drove a variety of vehicles, from a post-war Ford pickup to tractors to a combine harvester to a large truck hauling grain.
It's hard for me to imagine self-driving systems replacing at least some of these situations. I'm sure we'll see tractors with "robot drivers", and I'm sure no farmer or farm hand is going to miss the tedium of driving a tractor in a straight line across a field over and over, in a grass-mowing pattern.
What I have been unable to figure out is, if I want to drive across a field in a pickup on some errand or other, how I would be able to direct a self-driving pickup to do that. Everything I can think of, from giving verbal directions to using a smartphone app, seems awkward and imprecise.
Maybe it's just my lack of imagination, but I think that for off-road travel, we're going to continue to see humans driving the vehicles, until robots get a lot more sophisticated in maneuvering than they are today.
A documentary showing a DARPA challenge for robots performing several simple tasks, from climbing stairs to using a doorknob to open a door to using a hand-held electric drill to drill a hole, showed just how very far we are from having robots which can successfully mimic even rather simple human actions. No doubt someday, robot drivers will be better than humans at off-road driving. But I'm 62 years old, and I seriously question that I'll live to see that day.