It would seem that these days marriage should not be an institution that is entered into assuming it is legally binding forever. There should be some limitation in terms of time, such as making sure that children and their primary caregiver are taken care of. Our society has evolved, but we still think of marriage the way it was a hundred years ago.
Yes, marriage should be deinstitutionalized, because it is not a government function. The government has no interest in marriage. Now that the sexual revolution has taken place, and women are on an equal playing field with men, the state has no interest in protecting women's rights through marriage. People should marry whomever they want to in the church of their choice.