Two major problems
1) A lack of responsibility will not prevent conflict, as no resource is infinite, and there will always be things that people want that they simply can't have(Love, power, intelligence, admiration, etc). Further more, this will not prevent selfishness or greed. People have a need for conquest, if they think they have everything(By some divine miracle), they will not be satisfied, they'll just be bored. This theory will not eliminate the biggest resource contributer to human sadism, the social resource. It isn't poverty that creates anger, it's abuse, alienation and injustice. Equality cannot exist because not all humans are born with equal opportunity, thus there will always be injustice, that is the way of the world.
2) As with all decadent systems, a lack of conflict will rob future generations of understanding of their own system. If a perfect human creates a perfect place, then there will be no need for their offspring to live up to them in order to face the hardships they did. Thus, when they die, there will be nobody alive capable of understanding and upholding this utopia they've created.
It's hardship that makes people who they are, without it, they become compulsive and inept, trying constantly to find a source for their natural anger and angst, because without an enemy, they feel powerless and bored, with no chance to apply themselves. They become weak, subject to the eventual malfunctions of the machines on which they rely, easy prey for foreign rulers(If something is perfect, it is desired by all, and thus a struggle for power is created) and natural disasters. If utopia were possible, then it would have been achieved already. Perfection is unnatural, as it is imperfection and pain that creates desire, and desire which gives the will to live.