Utopianism is silly. A society where everyone is fully satisfied and does nothing else to improve or change things because everything is already "perfect" will soon stagnate and perish. Societies NEED change and transformation, as long as they have a few invaluable, core principles to return to, if the newest batch of change turns out bad.
Struggle and the never ending fight to evolve, improve, adapt, overcome is essential to the core of human existence. Dissatisfaction is essential to the individual human being as well as the collective.
You can be happy that your society is united, prosperous, safe and has good morals. You can be happy that you yourself are doing well. But to remain at that point is to DIE. Society always needs tweaks and fixes, you yourself could always be better. There's still so much left to discover, explore and learn.
To remain content with what you are and have is a death sentence. Always have something worthwhile to return to, but never stand still.