There's nothing wrong with communism or being communist, correct. But what we know for fact is that the human species is incompatible with communism, moreso as the population is increased. There is, by nature, traits within that are antagonistic with communism. Communism has failed every time. Our best efforts so far are embracing some communist ideals whilst pandering around with others.
Will we get there? Probably.
Within this era? Hell no. We've only just started evolving an adaption to a shrinking planet and working with neighbours. However, as you know we're still very divided, tribalistic, and prone to taking whatever advantages we can get. This is, after all, how we got to be number 1 and millions of years of evolution can't be stifled or changed in mere generations.
This is the realisation most people have during year 3 or 4 of the college communist phase. You accept the reality of Lord of the Flies and Animal Farm, that human nature is why we can't have nice things...yet. I reckon around 2100–2150, after we've been through some more shit together and wanked another world war out of our system.