I've been to Utopia a few times, man, and gotta say I *loved* it. Granted, the tough times for myself as well as the suffering of others certainly made me appreciate it more.
BUT, isn't our desire to 'appreciate' something to a greater degree merely an example of greed on our part? We want more enjoyment out of life and it comes at the expense of others. We're taking more than our share!
Which brings us to the nature of man...which is to ALWAYS seek to acquire as much of anything as possible.
And that is why balance of the mind, soul and body is needed. Which if you took all the parables and moralistic stuff out of the bible, is being taught. Balance and moderation. Actually what you say is the nature of man, is actually the nature of Western Man and those who are influenced by his nature.
Remember the stories about the American Bison? that their numbers were in the billions. Ad Ameridians only took what they needed. The Euros came and decided, hell lets take what we want...and shooting them for sport from trains. Their numbers dwindled. Or the Passenger Pigeon, same deal-the biggest flocks ever seen--billions of them. But Man decides to shoot and poison them for slave meat and feathers...No more Passenger Pigeon. Western or American Man in his ignorance was greedy and unthoughtful and his greed made a species extinct.
Remember the White tailed deer today? Well man, killed off most of it's predators, now the deer are everywhere---knocking nature out of balance.
The goal is for Humans to live in balance with Nature, and as such the nature of men with be one of moderation-harmony. Western thought revels in greed, excess. And time and time again, those that subcribe to that thought process gain what they want and more so, but like a fat dog, get lazy and lack the hunger. And what happens, another greedy man 9or nation or civilization comes up).
I think the real state of Utopia (or Nirvana) would be one of peace, tranquility, and a certain level of balance that one could only achieve with absolving one's self from societal accepted views on wealth, race, class, sex, religion.