I agree that gratitude is the secret to happiness; however, I think that if we are all happy and grateful there will be no progress in the world. Economical progress happens because a lot of people work hard to become rich/famous/powerful or because they are trying to fill expectations or are trying to make an example to those they love or to rub it in the face of those who don't believe in them. Surely when they finally reach the top they realize that they are still not happy. The world progress economically but maybe not humanly.
So I think we need to have people that believe that happiness is in gratitude, people that believe that happiness is in producing more and people that believe that happiness is in given other people opportunities.