Yes, the "long standing" tradition of marriage seems to evolve quite a bit over time.
I don't feel strongly about this myself use of the term "Marriage".
I only feel that any couple union should have all the same legal rights as the others.
I do try to be respectful of a large group of the population that does not believe as the US Central Government Supreme Court ruled.
I got married in the eyes of my God and I could care less what the Government thought or required (it was none of their business) but I changed my mind when my daughter was born and realized the government entitlements she would have if we were legally married.
I can see many of the states making amendments to their laws to replace Marriage with Legal Union. and ...
Letting registered religious organizations issue Marriage certificates which may require a Legal Union before issuing a Marriage certificate.