I like that too. It's unfortunate that the idea I perceive has been done in XIII already, but still, let me get it out. Since FF starts out with the Warrior of Light arriving from "elsewhere" and the game ends with the Warrior further into the past to defeat Chaos and end what would have been a temporal paradox.

If we were to look at this like Doomsday where the safest and most civil way to live after the loss of most of the world's technology (and the rise of monstrous fiends) was to go back to medieval ways, this could be a plausible look. Though since we haven't reached that point in time, we'd have to rely on the film to dictate the plot.