Capitalism is not some social evolutionary adaption that spontaneously arose from the grass roots of humanity. It is an oppressive regime that was forced upon the world by a tiny group of people with concentrated power, for their own benefit.
Those of us with anarchist leanings seek a bridge out of this prison, and not necessarily a bridge to an alternative structure, but an escape to the freedom to cooperate and organize voluntarily without hierarchical power structures and institutionalized coercion.