It really didn’t, and the entire premise of “Idiocracy as predictor” is a genuinely nasty thing. As it stands birth rate doesn’t seem to primarily correlate with intelligence, but socioeconomic status and education. Painting poor people as stupid breeders who will outcompete the genteel intelligentsia isn’t some new and prophetic idea.
It’s shitty, and using the movie as a canard for that old and tired view is shitty as well.