I don't think we'll ever achieve utopia, but it's easy to imagine that things could be fairer and more efficient. Maybe we'll finally replace corporations with something more ethical. As for dystopias, most are really just the classic ape hierarchy on a massive scale. One or a handful of alpha males is in charge of the government, which is mostly just a collection of bullies.
If you mean a story concept, I have The Billion Worlds, a sci-fi story about being invaded by people from parallel Earths. There are a thousand million of these planets, all part of a feudal human empire, and each is extremely backward both culturally and technologically. (At best, some worlds have muskets and cannon.) The Emperor is three hundred thousand years old and extremely set in his ways. He, his family, and his parallel-Earth doubles make up an aristocracy that makes the Spanish conquistadores look unmaterialistic.
Within the empire, it's basically a non-stop human rights abuse horror show. Slavery is legal and is a major part of interworld trade. Entire planets have been turned into labor camps of one form or another. In one world, the whole of North America is just one gigantic pig farm. (The pigs eat better than their minders.) Outside the empire, there's all sorts of threats: Dinosauroids with advanced technology and a taste for human flesh. Eldritch abominations. Frickin' elves.
Our Earth is much more advanced than any other human world, but the aristocrats have really good teleportation powers. They could drop a million musket troops into a city if they wanted to, or simply teleport the city to a world that never developed an oxygen atmosphere.
EDIT: I just remembered that there's already a Taoas series called The Hundred Worlds. Guess I'll need a new title.