the greatest enemy capitalism has ever known throughout the history of economics is not communism or socialism, but corporatism. a corporation is a top down autocratic organization that seeks nothing but more profit, be damned any other concerns, like fairness or egaltarianism. when they get large enough, corporations dominate their marketplace by dirty tricks like undercutting competitors prices to destroy them, and rent seeking agreements once they own the whole marketplace by colluding with other large players.
Yours is a populist post full of fear mongering that will never come to pass. You presume bigger is better which is demonstrably true by the last economic collapse. The largest tier financial institutions were decimated and many smaller institutions.
The larger an entity becomes, it is more efficient, but it is also more susceptible it is to rare, dramatic events (e.g. the housing collapse). Taleb calls these Black Swan Events. This is due to complexity growing exponentially as size increases. At some point, like the dinosaurs, an unexpected event happens, and the smaller mammals who are better able to adapt end up feasting on your corpse. Top down run organizations, like the Chinese economy, are very vulnerable to this type of risk in addition to a number of other inefficiencies it suffers from.