Even if they had the world just the way they desire it, I promise you they will screw it up and segregate themselves into a small, controlling in-group and a larger, disenfranchised out-group. People will compete to be the top dogs and devil-take-the-hindmost. All the resentments and conflict they thought they purged from the world will come flooding back. They won’t be able to help themselves.
Europe upper classes already tried to create a utopian socieyt, but they just ended up as inbreds.
Trying to achieve an earthly utopia ultimately produces just one person remaining.