By whom? I personally don't recognize a couple as married unless they were married by a priest, minister, or rabbi. Without God blessing the union, in my opinion, it's nothing.
My wife and I were married by a judge.
I'll go let her know that "old and tired" thinks it's nothing.
Sure, we can say that marriage is a church matter and not a government matter, but that really becomes the equivalent of saying "There isn't going to be much marriage in our future, because so many people have given up on religion". And so you just have people milling about having babies with various people.
We have a problem, and I'm not sure that giving up a legal (government) approach makes sense.