What will people do if artificial intelligence and robots take care of everything?

Yeah, this is a concern. Until now, every new technology has brought new jobs with it, but there are no guarantees in the future. And new jobs don't really help the people who are displaced from the old jobs, so there will always be difficulty during transitional periods.

According to the videos, though, there's already a labor shortage in farming, so maybe the negative impact from the autonomous tractor will be somewhat small.