@chai2,
Actually, 'traditonal marriage' has changed ... over the centuries.
At least in the so-called "Western societies".
The US marriage lawis is based on English marriage law. English marriage law is the the product of Canon Law.
Canon Law is a "Christian variety" of the ancient Roman Law.
IN the traditional marriage in Rome, we had three forms of marriage:
confarreatio,
coemptio and
usus.
I've no problem at all whoever defined marriage in what way ... if that is done as a traditional ceremonial festivity in a church or similar or different.
But since we all live in countries where state and church are separated, and - to my knowledge - no A2K'er lives in a theocracy - "marriage" is regulated by country/state law.
And that's just a registration.
I know, of course, that from time onwards civil authorities registered the human life they only carried on what the church had done before.
However, over the centuries they changed a lot, made different laws: divorce became possible, wives and children got rights, etc.
And authorities abandoned some church ceremonies: there's no civil first communion/confirmation for instance.
I'm sure that it won't happen tomorrow, but in the not to far future 'marriage' will just be a registration of two persons by a state authority .... and perhaps something different, "traditional" in churches, with one man and oine woman, or with ...