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>barring some kind of sci-fi AI that manages everything for us

At which point we'd need a Butlerian Jihad.

Recommend reading Daemon and Freedom™ by Daniel Suarez. It describes a reasonably plausible transition to a society managed by an impartial AI.

I'm less concerned about the social and political aspects of governance and labour by AI, and more the big gaping spiritual hole it'd leave us with.