We have one historical case to analyze here, so it seems a little strange to extrapolate from the last 500 years of human history to all possible histories. Capitalism is the product of a series of historical accidents; if it had developed under different sociohistorical conditions, it would be perpetuated by a different set of ideological tropes and social practices. There's nothing inevitable or necessary about actually existing capitalism or the ideology that supports it. (--Perhaps just file this under "there are more things in heaven and earth, Horatio, than are dreamt of in your philosophy".)
Miles