Anarcho-Capitalism is the only form of anarchism that is sustainable.
If all governments were to suddenly disappear tomorrow, some places would be more capitalist than others, based on the property owners' ability to defend their property. They would then be able to use their property to produce, and,
as history shows, be able to produce more than their socialist neighbors based on explicit incentives for mutually-beneficial cooperation based on property rights. More competent individuals who benefit more from a society that recognizes property rights would gravitate toward those places, while incompetent people seeking for someone else to pull their economic weight for them would gravitate toward the socialist areas. The capitalist areas would experience the natural emergence of beneficial capitalist institutions, like
private roads, private schools,
private protection agencies,
polycentric law, a free press, and so on. The socialist areas would experience conflict and oppression, as has always been the case throughout history. The differences in economic productivity (i.e. per-capita GDP) between socialist and capitalist anarchists would continue to grow, with more and more starving socialists defecting to the capitalist side day after day.