The ultimate utopia would be a world taken care by robots constant cloning more humans, so more and more would exist to be 'happy'. Then inject heroin into them to make them happy. Or any kind of drug that makes humans happy. If the brain gets used to being happy, genetically modify it so it doesn't. So all humans can be happy all day long.

And there is no 'need for freedom' becouse no one would know any better then infinity happyness.

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In theory, it's possible. However the question would remain or people would still be people if they lacked the ability to feel sad or atleast 'less happy'.

My point is: What common happyness matter.