I strongly doubt that it's going to be a rule as such, but in the US zone visit, AM3 said that a sister married a guy that was 23 and not an ms and she "payed for that won decision"
In the end, it probably won't change much of anything. The girls that are so super dub that they'd obey that bs rule would only want to marry an ms anyway. If anything it's probably just going to help save a few men from marrying the super cultist women, so he's really doing them a favor.