Evolution of the brain

You know the evolution theory? Surviving et cetera et cetera?
I'm sad. People are spoiled nowadays. Aren't pro-active anymore. Complaining. Sitting on the couch. Not curious enough. They want everything without going through too much trouble. Not using their brains anymore.
Following the theory of evolution: when you don't use a certain part of your body anymore for a long time ... it's getting smaller and smaller till it disappears