What's the point of inventing the wheel. We didn't Need it.
Ontopic: I am not a professor or have a phd in politics. So I may come across as misinformed. However, I'll state my opinion based on the limited knowledge I've had in the subject.
It's most likely inevitable through the course of history that mankind will go into some form of world government. Old rivals have become allies to oppose greater foreign influences. Eventually these alliances will overcome the globe and it will not be a choice to be against the massive political alliance (see the middle east). Eventually humanity will realize how more efficient it is to spend resources on butter instead of iron and will gladly join the alliance (if they're not radicals who believe in anything opposing humanism).
Most people seem opposed to the concept because of paranoia of a draconian system. No doubt that it's possible. But predicting specifics beyond what we have not already invented is kind of odd. There's a reason people say whatever happens after this technological singularity(if it will occur) is unpredictable.
Edit: Google globalization economic growth correlation.