My point is true capitalism does stay pure for long. The heirs of the successful ones will either create systems of control (AKA governments) or corrupt and coopt existing governments.

Feudalism was an improvement on slavery, capitalism is an improvement on feudalism. Now we need an improvement on capitalism. My contention is Anarchism Without Adjectives could be it. (NOT Anarcho-Capitalism!!) Communism had its chance and it failed because the levers of power were seized by the Stalinists, as predicted by Anarchists such as Bakunin.