The amendment does not remove the South from Atlasia automatically, it merely calls on Southern Legislators to begin negotiations with Nyman on the South's status within Atlasia. It also leaves open the possibility of a "soft exit", under which the South could retain voting rights but be exempt from many federal laws. I think it's far too early to tell what the final outcome of this will be. Given the lack of energy many people seem to put in this game, it could end up just fizzling out and resulting in literally nothing.
As far as the positions of those of us not in the South, I think we're all kind of bewildered that it actually passed and figuring out what should happen next.
I strongly oppose giving them special status either within Atlasia or as a 'partnership' betwen countries. The federal government needs to take a stand here and make them accept they will lose the benefits of being in Atlasia if they leave.
I won't speak for Weatherboy or Forumlurker, but I would likely ignore any secession attempt as long as I remain a member of the GM Team. As far as I am concerned, the South is, was and will be part of Atlasia.
