The opening sequence from Idiocracy is, imho, one of the greatest pieces of cinema ever created.
And it has always seemed to be an ominous and accurate prediction of where our species is headed. With no natural predators to thin the human herd, the process of natural selection seems to have ground to a halt. In fact, given that homo walmartus (example) seems to reproduce earlier, more often, and with greater genetic diversity than homo sapiens, it seems certain that homo sapiens will, one day, be extinct, and homo walmartus will inherit the earth.
But then, I read about this guy who jacked himself 400 offspring.
I never considered that artificial insemination might save us from a devolutionary slide.