I see no reason for marriage, or even cohabitation. Exceptions might have to do with financial or medical security (such as being able to have medical insurance) or legal rights to properly care for one another.

I don't think so, It will be over when Christianity is over and we're not near that yet.

Can you put your "room mate" on your health insurance? It's things like that which will keep it around.
That and I can only imagine how much more difficult things would have been with my late husband's mother if we had not been married whatwith her propensity for creating scenes at the hospital when he was dying. Yeah naaaa. It's all fun and games until you're left lying around in your own stool when your time's up.
Her bullshit would have had him alone unless banker's hours, at risk of dying alone.

If it is over that is okay. Where I live, common-law relationships among the younger people is way more common than marriages. Perhaps watching the boomers go through all of their divorces taught Gen X and millenials to delay or avoid marriage?? hehe