I always thought demand was limited by factors such as the size of one's stomach the speed at which clothes wear out or go out of fashion, and most importantly income among other things. I'm actually kind of surprised to hear that unlimited demand was a fundamental tenet of economics.
Historically it has never worked out that way. When a society gets richer the people eat more and better food, buy more clothes, live in bigger houses, buy cars and appliances, travel more, and so on. Based on the behavior of rich people we can see that a x10 or even x100 increase from current wealth levels due to automation would just continue this trend, with people spending the excess on things like mansions, private jets and a legion of robot servants.
Realistically there's probably some upper limit to human consumption, but it's so far above current pr...
As Multiheaded added, "Personal is Political" stuff like gender relations, etc also may belong here.