Shame on you!
This is size-fits-all taken to its extreme form.
Let me tell you, outside of liberal la-la land, what would happen if we implemented a world government tomorow:
A coalition of indian and chinese would come into power, who would "find" that the weestern world has too much money and they themselves too little. They would start a massive redistribution campaign to destroy wealth in the developed world and prop themselves up.
Is this what you want? Seriously, there once was a time when decentralization was a liberal ideal. Where has that gone to?
First of all no specific plan such as that has been laid out. Even if a unicameral population based legislature was given complete control, I seriously doubt China and India would form a coalition to get money. They'd each claim the right to more money and all hell would break lose. They hate each other anyway. Anyways I would see a bicameral legislature with something like the General Assmebly involved diminsishing big countries' power.
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