If we have ASI that’s both smart and benevolent enough to hand over all real economic activity to, it could give each person a bespoke series of challenges that would keep them active and happy.
(It could even give everyone a unique “fake but real” job, where any person failing to perform their job naturally results in making others’ lives worse in a way the AI archangel won’t fix, albeit with a guarantee that nobody’s life can actually be less than quite good overall. Say there’s a little community where the archangel gives everyone their job—you’re the one who keeps the garden, you’re the one who brews beer, and if you don’t brew beer nobody drinks it… If someone is bedrotting they get assigned more responsibilities, if they’re wearing themselves out they get less.)
Gradual disempowerment.