Not all that unreasonable, perhaps.
Ken MacLeod shows us that science fiction has already shown the way to worldwide peace:
We already know how to have peace over large areas of the Earth, and that is by having large states covering those areas. (The combat death rate for men of military age in typical stateless societies far exceeds that in inter-state wars, including world wars.) SF has in its default assumptions a way to get to peace without pacifism, and that is the World State. Even Starship Troopers gives this answer, just as much as Star Trek or anything by H. G. Wells, Isaac Asimov or Arthur C. Clarke. Heinlein’s Federation is a World State, and (consequently) there is peace within the human species. It just has wars with aliens.
But there are no aliens. So we could have peace.
Of course, being Ken’s blog there’s a whole argument in the comments, but that’s the thought for the day. Perhaps we could call them Oceania, Eurasia and Eastasia. Or has that been done?