When you make driverless trucks what do you do with the truck drivers? The humans. Sure, you'll have more trucks because they are cheaper and more efficient now, but what does that human do? They could load docks, but there aren't enough of a demand for that, and it too will be automated soon. A McDonalds won't need to hire more when you have automated registers and cooks. Maybe a few people to check on things and be there when something breaks, but not nearly the number you have now. So yes, you can increase the number of workers, but that doesn't mean you are increasing the number of jobs. And sure, you could have more repair workers and programmers, but we are already seeing that retraining workers isn't working. And this is still a temporary fix (not saying we shouldn't do it).
My real worry is the big question: "How do you transition into post scarcity society?" That is really the future we are headed for, and I can't wait. But that transition is difficult. Currently we value social worth on the net wealth of a person. How do we transition from that when jobs become obsolete? I'm just talking about when 10% of jobs are automated and we haven't filled the gap. That's huge.