Divorce rates always stagnate during recessions and depressions. Some folks stick together for monetary reasons.
When the economy is doing well, divorce rates begin to rise again. If memory serves, the divorce rate in the 1930's actually stayed the same and even might have gone down a bit. It was rising before the depression, and rose again after.
I'd guess the current divorce rate reflects where the country's economy has been the last couple of decades. Stagnate. If we're lucky enough to find a government that is interested in creating jobs and prosperity again? The divorce rate will likely rise again.
The average life span has to have something to do with it, as well. People that were 50 years old 100 years ago were a lot different than people that are 50 today. Lots of life left in this century. Not so, the last.
"Traditional marriage." Used to mean "for life". Now, it means something different.
I'd say a higher divorce rate just might mean a happier populace. Higher divorce rate means the economy is running well. People are living longer. And people are free to make better choices for a mate without societal constraints chaining them to a miserable situation.
And as soon as the rest of the populace catches up to us swingers? It'll be even better,