Depends what you mean by that.
If you take Hobbes very literally, then I would disagree with him, because violent mutual annihilation is not "ecologically stable". But, taken in a more general sense, he was correct - gov is a means of safer conflict resolution.
The so-called "Wild West" was not so wild after all... Pennsylvania colony existed in a state of anarchy for several years... Somalia
Correct. It is not a good example of anarchy. It had local centers of authority. You pissed off a town? They would throw you out. You came back? They'd give you the necktie. You'd cross a gang? They'd shoot you dead. All perfect examples of a larger superior organization (township, gang, "the law") violently eliminating the competition (you as a misbehaving individual).
Penn existed for several years only. It seems the concept failed when put to the real test.
Somalia is an example that fits well in my framework - competing organizations (the different warlords, gangs, and tribal groups) have near-parity in power and thus refuse to exhaust themselves in pointless fighting, lest a third party take advantage. They are waiting one another out. If a single group gets enough advantage, they will become the single government.
Protesters at Tiananmen Squareconstructed and operated a successful anarchist society for two months. (Ironically, they gathered to demand democracy, and seem not to have appreciated that they were actually enacting something better.)
Successful how? Clearly not as an organization. The commie gov crushed them. Two months don't even register as a spit in the ocean of human history.
Whenever people come to a four-way stop sign, or wait for a bus, or spread a beach towel, they demonstrate non-violent conflict resolution.
Based on the rules enforced by the gov. Many people will do the polite thing because they are programmed that way, or to avoid conflict, or out of altruism (Dawkins has interesting things to say about altruism too). But, there are also violent individuals that will push their way through or step on your towel too. Your anarchistic society cannot deal with them. If you try to apply a force against them as an individual, if one of them is stronger than you, he will kill you. If he is not, he will gang up with others. Guess what, they just made an organization and formed a bandit government. You are history.
That definition is singularly slanted in favor of the state: if "success" is roughly defined as "power," especially coercive power, then yes--totalitarian societies are the most "successful." But who cares?
You should, if you want to avoid being crushed by one.
I didn't say "only." But if you drop the "only," what's left is absolutely indisputable.
Be honest. You heavily implied the "only". It is the center of your argument.
What you can't claim is that we've tried anything else. Arguably, we couldn't have tried anything else prior to the 19th century: before that, practically everyone hovered on the brink of starvation. A handful of the most hardened anarchists might resort to a tribal structure in a survival situation.
Many organizations have existed before 1900 - autarchy, hereditary monarchy, empire, triumvirate, republic, limited democracy, oligarchy, theocracy, constitutional monarchy. They were not really "tried", they evolved due to circumstantial pressures. As conditions changed, one replaced another. How different they ultimately are is subject of discussion.
Many people in the world hover around starvation today as well. The only ones that may allow themselves to toy with "something different" are societies that already are well-fed based on their own evolved organization. I am not convinced that "trying something different" will not revert us to near-starvation. It certainly did with the commies in the 1920s.
The anarchists would be smart to organize into non-anarchists. Otherwise they would likely starve.
Yup. What hasn't been tried is unpremeditated, non-engineered, decentralized society. I don't know of any libertarians (or anarcho capitalists) who suggest that a centrally-designed society is a workable idea. The free market is the antithesis of that.
Re-read what you just wrote and see the internal contradictions. You want to try something that is unpremeditated and non-engineered. If you do not meditate or engineer, how do you know what it is? How do you know what you have or want? The minute you describe what you are trying to do, it is engineered and premeditated.
If there is anything unpremeditated and non-engineered, that is human society from the early historical perspective. They did not sit down and plan it that way. They did what they could to stay alive. Those who hit upon successful models lived, those who did not, died. Literally you are right - they did not "try it", but historically you are wrong - such societies did exist and evolved into being.