Well, I don't think it will happen neither. By instruction I meant the Church would go back to the first few centuries before they offered any church wedding ceremony; precisely because the majority of society had no idea what true marriage was and today we have have come full circle and bring our faulty baggage to the altar. When society became Christian and the state worked synergistically with the Church for the salvation of its citizens it handed marriage back to its proper place. Now that we have come full circle it may be necessary in some future time to put away the crowns and end its usage.
St John Chrysostom's on his homily on Ephesians (ch 5), concerning marriage is what I have in mind. There wasn't to my knowledge at that time any elaborate church ceremony, but he explains that true marriage is a mystery only in Christ. He explains the theology and gives instuction, he also warns Christian spouses not to imitate pagan practices because it then ceases being a mystery, unfortunately these are practices we accept today.
St John Chrysostom:
...'This then is marriage when it takes place according to Christ, spiritual marriage, and spiritual birth, not of blood nor of travail, nor of the will of the flesh.... Yes, a marriage it is, not of passion nor of the flesh, but wholly spiritual, the soul being united to God by a union unspeakable, and which He alone knows....'
