Human nature is not greedy, and by stating so you throw the whole concept of psychology in the trash. How socialism will come to be was explained already in deeper meaning. A description is best understood when one has a background in philosophy and has spent YEARS reading upon the subject rather a few days or weeks, reread this.
"We socialists do not wish to have our own party, for that concept is quite hypocritical. I do not agree with the concept of the American Communist Party or parties such as the Communist Party Of China. I know the Party of china will lead to eventual failure for all the oxymora that preside in the party itself. For example we do not agree with the the entire aspect of the American democratic party, but we favor their agenda because they grant more power and rights to man kind on a larger basis. Gay marriage, clean energy, higher wages, are all on the table of the democratic party and that is why Socialists many times side with Obama, though Obama is of the Capitalist system. Future democratic agenda will change the way people think, and the more people change their way of thinking, the more human and intellectual we become. Socialists in other nations think like-wise, for they are the proletariat that tend to reconstruct the agenda of their own politics, and slowly fix the social problems at hand there. The republican party, with the concept of conservatism (conserving the structure at the present and preventing progressive change) just keeps society back-peddling. "
Socialism will work and come to be based on the liberal measures we implement in our present day society. Basically, the future is determined on how we build our society TODAY. The mind is a powerful tool, because the mind constructs the future environment, and this pattern has ALWAYS taken place in history. The minds of the slavery era eventually developed into feudalism, because changes were made over time via ideas and inventions that gave more knowledge to the oppressed slaves that built that society. You know how we keep learning certain lessons and measures in our own personal lives as we grow older?
We gain tools to deal with certain obstacles and situations the older we grow. We fail to make the right choices when we are younger, because we do not obtain social skills and crucial tools at that time. Make more sense now? Stop worrying about other people and look at yourself, what kind of person are YOU? Change is ALWAYS possible, and when you say you can't do something, or society says it can't do something, it reveals just how childlike our society is in terms of its mentality as a whole. But alas, change is good and inevitable when progressive ideas are taking place.
Example, fighting for green energy is ONE key element to socialism. Green energy that is powered by solar panels and wind opens the doors to not requiring money to keep our world powered. You could fill the entire Nevada desert with solar panels and without ANY other plants using nuclear energy (Toxic waste that pollutes the earth and wastes millions to clean up) or coal which become a thing of the past because we LEARNED how dangerous those methods are. People continue sucking the blood of the earth (oil) and don't care that sink holes are developing around the earth causing massive damage and home losses and lets not forget the growing number of earthquakes. Just one example how Capitalism is damaging the planet because oil produces BILLIONS of dollars in profit for capitalists that make energy a business.
It's basically little baby steps that allow us to evolve naturally on our own. THAT is how socialism works. People learn on their own that things are MORE efficient without the concepts of "money" because the need to accumulate money/profit leads to so many other crises poverty and starvation being the biggest ones.
As for china, it was NEVER communist to begin with. I am going to write a summary of the history of the soviet union with specific key points in its government structure that will help everyone comprehend just how fucked up American text books are. I do not support the government of the USSR and I think its very sad how many lives were lost. China, I admire for its structure of Capitalism because they are progressing. I am not happy that they are CAPITALIST, I am happy they are moving forward, for they are NOT "going back to Capitalism." They were ALWAYS Capitalist to begin with. They used money and the notion of being a country and being surrounded by "countries" the entire time.
In a simplistic notion, Capitalism is taught in our textbooks that it is an economic model, but with a deeper and more complex observation that is omniscient, it is nothing more then an "era" of society. An imperfect era that is so heavily flawed NEVER lasts forever, because all the growing in that era develops something that is BETTER.