One feature of such a better society is that it should be classless. As long as there is there are segments of society whose happiness, health, and stability are dependent upon the whims of the ruling class rather then in their own hands then these problems will persist.
People don't want a classless society because it removes the ability to attain the one thing that all people want: distinguishment. People usually want money not for its utility, but as an arbitrary measure of merit and a way to distinguish oneself. This is why the American Dream is so pervasive: the concept of economic mobility appeals to people. If anything, we've seen a regression from equality and an exacerbation of class segregation throughout the century.
People (at least in this country) don't want to be happy and healthy. They want to be richer than everyone else because that is what success is.
I think that you are right that there are some people that will not become happier or more healthy if they got more money. More money does mean "distinguishment" to them. I think we could describe American upper and middle class people in this way.
The vast majority of the people in America and the rest of the world are not upper or middle class. They want both "distinguishment" AND health, because both could improve. Look at health problems and obesity and the poverty line and education rates. Look at what happens to the birth rate when you introduce economic stability and health care access that can more or less guarantee the survival of your children.
I agree completely. Sadly this is an extension of the democratic capitalist way of life. Once upon a time a group of people we're lead by the strongest, the most intelligent, and the most experienced. It was natural selection at it's finest. Now the concept of power is based on money, distinguishment, and popularity, and not on strength, smarts, and age.
We are making progress. It used to be your class was determined by how much money your great great great grandfather had. Now it's determined by how much you have. Soon it will be determined by how much we think you will have based on your profession ("oohh a doctor"), health ("oohh she's skinny and eats right), habits (non-smokers). Eventually that bubble will pop or cancers/diabetes and other ridiculous ravagers of our species will be eliminated. Class has a real shot of being eliminated then.