> If we can automate simple manual labor, people will shift to different tasks
You aren't understanding the scenario, you're presuming there's always other tasks to switch to because you're presuming a labor based economy. This must change as AI will ensure there aren't other tasks to switch to, not enough for everyone anyway.
The scenario everyone else is discussing is what happens when there are more people than available jobs. That's the scenario you need to address; the answer is not just do another job.
You aren't understanding the scenario, you're presuming there's always other tasks to switch to because you're presuming a labor based economy. This must change as AI will ensure there aren't other tasks to switch to, not enough for everyone anyway.
The scenario everyone else is discussing is what happens when there are more people than available jobs. That's the scenario you need to address; the answer is not just do another job.