Communist Marxism, One would be thinking, why it needs Capitialism to Survive, the answer is Easy.
Communism requires its own Enemy aka Capitialism, because without Capitalism, whether one agrees with it or not, to give its movement the fire to continue its fight against the Capitalists or Capitalist Elites.
Whilst this Occurs, with Communists also in places of Power, doing Capitalist Jobs, some even high up in the Capitalist Elite, as Directors of Companies to even floor staff.
Just Like Islam It requires their Enemies aka The Jews/Christians & Non Believers to still exist in their world for their passion to burn against Destroying their Enemy.
Once you Remove the Enemy factor of Both, they will Disintegrate, an this is where even Anarchists have seen the error within Communism, though there are are both Lifestyle Anarchists & Social Anarchists, The anarchist is also able to find a way to still survive even after the fall of Both Islam & Communism.