There is a cartoon where a scientist travels to the future and finds the world has become an utopia. A friendly host shows the scientist the wonders of his world, and then says something like "no one is poor or hungry anymore, we have everything to cover everyone's needs, even a beautiful house for each". The scientists asks "Why not two houses?". The end panel is the scientist getting back into his machine while a nuclear mushroom looms in the background.

My point is, people doesn't seem to be made to be fully happy. Yes, we enjoy the high of happiness, but soon we come down and take it for granted, then something else we don't have is what will make us happy. I think this an asset, what makes us human and what encourages us to strive for something more. This is also a liability, as we easily lose perspective and purpose.