A reasonable, albeit lossy, gloss on "bright" is "someone who earns their living through intellectual labor". Clearly there are mathematicians who become potato

A reasonable, albeit lossy, gloss on "bright" is "someone who earns their living through intellectual labor". Clearly there are mathematicians who become potato farmers, but what we don't see is movement in the other direction: call it sufficient but not necessary. The corollary being that those people are already earning their bread doing things which an artificial intelligence can't replicate. I've seen many vast overestimates of how many of these jobs could even be replaced with a Jetsons robot, and we're nowhere close to deploying anything vaguely resembling one of those.