Having just read the new testament over christmas for the first time in a complete reading and without watchtower bias, I came to conclude what had bothered me for a long time that it was surely a heavenly hope.
Also as has been mentioned what was the original purpose for man? Do we really know? Witnesses assume if they (Adam & Eve) never ate of the forbidden fruit man would never have died, but what seems to be indicated is that he would have needed to have eaten from the tree of life, and so all God did was prevent that, so he was always going to die until God gave him the fruit of that tree - which must have been his purpose. So the scripture in Revelation that I think Auld refered to is linking a restoration of God's original purpose but we know these were going to heaven. At least thats how I read it.
Also one further point, say they didnt eat of the forbidden fruit and lived forever as you suggest (or the Watchtower does at least) then were they to have been ignorant of right and wrong not being aware of their nakedness too, will that be your hope in paradise in line with the original purpose as you see it??
I really dont think God's complete purpose was fulfilled so we can not catagorically say what it really was can we.
Arnie