There’s actually a method and approach for getting to this recurring dream from the way things are now, affiliated with Ken Wilber’s Integral philosophy and Don Beck’s Spiral Dynamics.
“A Declaration of the Value of Global Governance
The Declaration below is an on-line petition to the leaders of society to recognize the value of establishing a democratic world federation guided by the enlarged understanding of history and culture provided by the integral worldview.”
http://www.integralworldgovernment.org/