I wanted to find some more information regarding polygamy and I found this interesting map:

http://en.wikipedia.org/wiki/File:Le...f_polygamy.png

It would seem that the majority of the world considers it either highly illegal or or you'll be so shunned that it may as well be. This is a completely different situation than bringing up your equal rights comparison to same sex eternal bonding. Given this kind of situation, SE would face a boat load more critism than they would for the same sex bonding. Given that, the chances of it happening is slim.