No, it will never become obsolete. It is the best and most enduring unit for the creation and rearing of children. And if a marriage didn't work out, the sexual revolution removed some of the stigma and said there's life after marriage. What the sexual revolution also did, was make sex better inside of marriage, so we improved it for everybody. It's not at an all time high.
Marriage is a fairly fragile institution.
The Depression decimated marriage. Returning veterans from WWI walked into dead and lifeless marriages. Half of them will not last. It will privatize abortion. RU486 creates a medical miscarriage.