There is only a small change of getting there if few agree with you. But I contend that even if only 100 of the approx. 6,845,146,634 people on the planet decide on a peaceful life and make their own little village, that the world around them would begin the change and the world would take notice.
While fast food is not directly related to a perfect world, it does work as an analogy in this case. In America, you cannot be farther than 145 miles from a McDonalds *Linky Linky* (
http://www.good.is/post/map-of-every-mcdonalds-in-the-country/). It started as a single restruant in 1940, and today its the biggest fast food chain in the bloody world.
While fast food and world peace are unrelated for the most part, it does show that when something desirable is created, it becomes something big, and when the desire never fades, then it basically becomes permanent.
If 100 people create for themselves a peaceful existence, then others who wish for the same existence will replicate it, just as they replicated mcdonalds...again...and again...and again.
The mistake people keep making is trying to uniformly change the world an bring it to a state of peace. You can't just march off to third world countries and provide schooling and medical care and expect change. This just enables better lives, and a better change to have more advanced weapons. I could go into detail, but its not that important.
To begin the process of changing the world, you must first, and foremost, be at peace with yourself. Being at peace with yourself, others will feel more at peace around you and will want to be with you more. They will, in turn, become at peace with themselves.
So Lets say that for the first decade, there is one village on earth that is at peace with itself. It does not govern itself, because there is no need. People are at peace, no longer pulled by the desires of the world, they do not steal, they do not kill each other.
So after the first decade, someone else decided that this is a good way to live and makes another settlement of peace and more people come.
After a while more, another settlement.
I don't know how much time it would take, but it could happen. The problem is that most people don't want it to happen. They want to remain in the world of strife and hatred, of wars and poverty, and all of that. And so desiring war and unrest, they create it and call it government. The question is not what is the perfect government, but rather when humanity will decide to live in peace and leave behind governemnt all together. When we make a conscious choice, either as a whole, or in small parts, to leave in peace, we wont have need of government because we will no longer need laws to keep us from harming each other.