The reason for polygamy was for breeding. The Lord needed a strong, growing LDS population when the gospel was restored.
I do not like polygamy, it hurts me. Emma did not like polygamy, it hurt her.
It is true that polygamy will return. Those that have already participated in it will do so again in the next life, if they choose, not on this side of the veil, but in the resurrection . The LDS missionaries are strong here on this side of the veil and plural marriage is not required. I am so glad that God will not force me to participate in plural marriage. I don't share, Emma did not want to share either. Free will is an eternal law. God will not force anyone to obey or disobey, He will not force anyone to heaven, or to hell. By our actions we choose. Force is Lucifer's plan. (you all knew that, sorry for stating the obvious).
What I have always wondered about is why was it just Adam and Eve? Why wasn't it Adam and Eve and Sarah and Martha and Julie and Rosemary and Veronica? The population would have grown must faster.