Earlier quoted context omitted.
That's exactly the point. Humans rely on jobs, what happens when robots take over?
We don't actually rely on jobs, we just force one another to work to satisfy our principles of fairness. In theory we could agree on a different notion of fairness that doesn't require everybody to work, we just choose not to.
Human principles of fairness are based very heavily on social constructs of tribe and group survival that predate civilization by 10^5 to 10^7 years. Human thought is extremely malleable, I think the human psychology jury is still out on precisely how malleable "fairness" is.
That having been said, it feels like if we could start by ratcheting most people from a 40-hour week to a 30-hour week without cutting their pay, that'd square with the gut feeling of fairness. ;)