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It will never work. It is against human nature on its broadest sense. And by that I mean not only the way our instincts and cognitive processes often point us against seeing and willing ourselves equal to everyone else, but our very genetic differentiation will ensure that we and our achievements are always dissonant compared to our peers.
The closest we have ever been to communism was either bloody dictatorships ruled by extremists, or a few scandinavian countries whose low, stagnating homogeneous populations, international neutrality and vast quantities of untapped natural resources allowed them to implement social democracies without a significant detrimental effect to their progress during the 20th century...
There is something we can borrow from the so-called communist doctrines to fix capitalism's greatest problems though - its lust for endless progress and resource consumption, and the absurd levels of wealth disparity we are set to reach, the largest in the entire history of mankind.
