OK, trying to make this a little bit more than fluff...
When we're all literally visiting friends on the moon and commuting to work via space, will it put a different slant on the Watchtower doctrines which are about a literal earth such as the demons being herld down to "earth", the "four corners of the earth", the whole world is lying in the power of the wicked one, etc.
Also, if God had other planets inhabited elsewhere, doesn't it blow the whole ransom sacrifice thing out of the water, I mean God could have just killed Satan and Adam and taken a few ribs from another planet, if you know what I mean???