I think it stow a mirror of our society...we expect so much more to happen in our life....the government take over more and more of our duties...by day caring centers and home for the elderly. It is expected that both have to go to work in order to keep up with the standard put up by the advertising company....the life goes faster....we have less time for each other and the family.
This might lead to less understanding...and less will to search for solutions.
Many see even a little obstacle as something big and don't try to solve it at all....since it has become more common that people divorce...it is neither that big shame anymore to end it...and there is many that feel the grass is greener on others lawn
At the same time, people who live in "relationship" increase....so in a >50 years time I think only people who fancy tradition will marry....which again show that not all progress are good progress.....because if we take the children into account...a stable marriage/relationship is to prefer.