People can organize in a large variety of ways without centralizing power. This idea of "all economic systems suck, let's just make capitalism better" is misguided. Decentralizing the power structure within capitalism is tantamount to moving away from capitalism. What you call the economic system that results from this doesn't matter. The term communism for example is often used to refer to the communist party of the soviet union established by the Bolsheviks, despite the fact that the Bolsheviks betrayed the values for which the revolutionaries fought.

Communism is, by its' original envisioning, a fully decentralized economic system in which the means of production are collectively owned by the workers. Communism is decentralized by design and centralization results from flaws - often deliberate courtesy of selfish oppurtunists - in its' implementation. Capitalism is centralized by design and decentralization results from flaws - also often deliberate courtesy of those like you seeking to make it better - in its' implementation.

Trying to "fix" capitalism by introducing flaws in its' implementation will never make long lasting change; that can only come about by replacing the foundation of capitalism with something better.