Youre confusing ideologies. Communism, Capitalism, and Socialism are buisiness stratagies.
Republics, Democracies, Monarchies, Oligarchies, etc. are organization styles for governments.
We will never leave a Capitalism, Americans are too greedy and self obsessed to give up their capitalism.We love Money too much to be completely Socialist. A little regulaton can be an assistance when the market begins to slit its jugular.
Communisms fail! No question. As long as humans still have individual minds they will fail.