Plus, only a small fraction of Animal Crossing players, even lifelong series fans, will still be playing the game daily even one year later. In the real world, we need jobs done ~forever, regardless of how novel and fun they are.

Game design is fundamentally about feeding a steady flow of novelty to players. Too little and the game gets boring immediately, too much and the development team can't produce new content fast enough, or the game is too short. I can imagine someone arguing that we could rotate people through jobs as their interest fades, but we should be skeptical that we can maintain our standard of living when most jobs are being done by people whose professional experience includes novelty at the rate even a dull game offers.