Mankind needs a government. Which government? Well that's a bit tricky, but I don't think mankind in this state could function without a government.

Think of this. If some sort of disaster were to happen turning the world into anarchy. The people would be running around like a chicken with their heads cut off for the first couple of days (maybe).

But then, when one bright person, stops, breathes, and thinks about a solution to a problem, like creating a water system, (in light of the disaster), than people will look up to that person for more ideas and solutions for their problems. Automatically promoting that person to leader status, weather he/she knows and wants it or not

If Humans can survive without a government why didn't we stay as nomadic tribes. But even they had a system of government, no matter how small. Government is a bit more proficient than anything else.

Could we turn into a resource based economy later in the future? Possibly. But that's one of the only other system that MIGHT possibly exist. And that's a big IF.