This type of situation actually happens. I knew a Pakistani who actually decided he wanted to become mormon. Small problem, he had 3 legal wives. The missionaries told him he would have to choose and could no longer live with his other legal wives. He came to his senses and went back to his family. Ironic isn't it?
My daughter and husband, TBMs, live in Zimbabwe. They converted their maid and gardener to Mo-ism. The maid had been a polygamous wife there, and had to go through some sort of probationary period and interview process to insure that she wasn't still a participant in that.
I had heard sometime ago that the RLDS did allow new converts to maintain polygamous marriages in countries where it was legal to do so. Can anyone confirm? If so, sweet taste of irony.
So God says it's the New and EVERLASTING Covenant for about 65 years, then changes his mind (unless you flee to Mexico), so if you convert from a polygamist culture you have to give it up, except in heaven, where it's the New and EVERLASTING Covenant....my heads hurts...
Hey, that's another thought: why didn't God tell the church big-shot polyg's south of the border "It's over, dudes, didn't ya get the memo? Now go back home."