I must question The Hon. There is less incentive to enter a high-stakes relationship when one knows that the other party will always be able to disregard or abandon his commitment without facing serious legal obstacles or even social condemnation. The present situation not only discourages marriage, but also makes it less worthwhile to invest one's personal effort in an existing marriage. Marriage is the only economic contract everyone may break on a whim, without being held responsible for any damage to other people who are involved. That damage can be considerable.
Divorce is often nasty, brutish, and long.
Having children becomes far more risky when you might have little role in raising them. And if you are middle class, divorce will likely make you poor. After that, the richer one can get anything he wants in court. I am not exaggerating. As a divorce lawyer, I see this happen every day.