The movie is about smart people not breeding. The smart people stoped existing. It wasn’t a decision to ignore smart people and listen to dumbasses, there were only dumbasses. The obvious problem with the movie is that it’s about eugenics (which doesn’t work that way), but your take changes the plot to be about something that it isn’t.

They found the smartest person in the world and listened to them to fix their problems… Not at all accurate.