Assuming that the future history of humanity is not accurately depicted in Idiocracy, it's possible that large numbers of humans will eventually settle the solar system. These human communities will be isolated from each other and the languages that they use will change. What sort of accents might they develop?
Live Science investigated the scientific literature on accents developed in isolation. This includes a study of 11 researchers who spent the winter together in Antarctica and isolated from the rest of humanity. These people began developing a unified phonetic pattern in just a few months.
It is likely that the initial wave of colonists would establish an accent that later colonists would adopt. This is why the dominant Australian accent resembles the Cockney accent of the initial European colonists of that island.
Thus it will be essential that terran leadership ensure that the first colonists speak Valley Girl with a sharp vocal fry.
-via Dave Barry | Image: NASA