Let's divide this futures: Earth Hegemony (ala N.Spinrad's "Agent of Chaos") or State Earth (opposed to Mars Empire, Asteroid Confederacy, etc). It's very different social phenomenas.
First one is absolutely closed system with accumulative social enthropy, which will blow up state early or later. This state has 3 (I think you can find more) possibilities to survive in long term period: 1) convert population to mindless mass; 2) kill large amount of inconsistent people or remove them to a very distant places (hey, Australia

) and be at intensive brainwashing and freedom restriction for others; 3) create mighty artificial enemy (alternative evil state, aliens), but this is transient treat.
Which one do you like best of all?
Second one is just an expansion of current geopolitical structure, nothing new here, except some cultural alternations.
Quote:
The biggest hangup on the subject of world government is the mine is best syndrome. The same one I find in many discussions. What is the "best" xxxxxx.
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I haven't told than my vision is "best", I just "prefer" it

Nobody can't be absolutely objective, especialy then speaking about such subjects as future world order
