The problem is much, much bigger than this. The problem is not only marriage, it is the destruction of Law in general. Lawyers of the founding generation spent years studying William Blackstone's and Edward Coke's legal texts. The legal foundation that these books secured dates back to the Romans. Marriage is dealt with in Blackstone: he makes it clear that the purpose of civil marriage is the protection of children. When judges can change the meaning of words at will and then make rulings based on those changed definitions, we no longer have a legal system.
Lincoln suggested that America would be eternal if each succeeding generation had reverence for the law. I don't think he imagined the destruction of the law would be accomplished by the legal class.