I have read it many times. You do not understand it.
The covenant of marriage, in this case plural marriage, is "new and everlasting", not the practice of plural marriage. In other words, those plural marriages performed under that command were to be an eternal covenant. The section does not say that practice of plural marriage would be "everlasting".
Do you understand the distinction?
Well, you have an interesting "take" on the commandment since the who premise of the revelation was this quote
"Verily, thus saith the Lord unto you my servant Joseph, that inasmuch as you have inquired of my hand to know and understand wherein I, the Lord, justified my servants Abraham, Isaac, and Jacob, as also Moses, David and Solomon, my servants, as touching the principle and doctrine of their having many wives and concubines—"
The commandment was given BECAUSE Joseph inquired of God ABOUT POLYGAMY not marriage for eternity. But you view it through the eyes of the new and improved socially acceptable Mormon doctrine I suppose.
Q: Why is it that men can have more than one wife in eternity, yet women will have only one man?
Answer: Because the Church still teaches and approves of polygamy in the afterlife.
Q: Why??
Answer: Because it is an eternal commandment, and the only reason it is NOT practiced at this time here on earth is because it is against the law.