Its hard to say that i can relate to that article, as beaing European I have been brought up with the notion of getting married and having kids and not to late a stage. I personally believe that all marriages can be saved, bar extraordinary circumstances (cheating etc.), all it requires is communication. I know that sounds cheesy but all to many people, when faced with a conflict in a marriage, immediately reach for the divorce papers which consider to be stupid.
Theres not much difference in the escence of a relationship then it was 50yrs ago. Sure the culture has changed and the way we look at things, but the basic values of trust, love and respect are still prevalent today. My grandparents didnt stay together for 67 years just because they were madly in love with each other 24 hours a day 7 days a week, they did love each other but it was there ability to reason and resolve conflict that got them through that many years.
Thats obviously a factor in marriage, namely that it isnt going to be a fairytale, trips around the world with your prince (or princess) and before you know it your in a retirement home. Its going to be hard at some times, and i dont personally think that today's people have the willpower to stick through those hard time.