It will never be happened 'cause people will never be contended with their lives and everyone's point of view. idealism, philosophy is different from each other and just face the reality that the human is naturally born greedy or to be greedy, evil and lier is a human nature so, world will never be experienced peace and love. You can only experience that in the heaven. It's really sad but i am just saying the truth. Anyway, it's just my own perspective, i am either right or wrong so that you may be agreed or disagreed with me