Who said there would be no centralised command? It would just be opt out. If an individual/community wanted to opt out of this, there would be noone forcing them to not do so.

As for evolution of political systems due to natural selection, would you say the same about democracy? Stable democracy that we know about today has existed only for the past 300 years. Women got the right to vote this century. If u r living under a dictatorship, would you use the same argument of natural selection to not fight for a democracy?