All kidding aside, I'm thinking this is going to be an interesting transition. It's not unrealistic to conclude they're going to be trying to find some sort of scapegoat to focus on, jointly.
The South F/A's after a vote, I've seen before. The North, I'm sure are going to be shell-shocked, and paranoid. If there is anything at all to this "family" stuff, well, strike that, if there is anything to the idea that it's a more gentle, less hostile environment on the "South" side of the world, then I think our attitude will play a role. Not as much as the attitude of the "winners" in the F/A world, but some role nonetheless.
For my part, I'll do everything I can to be part of the solution. I've always tried to be polite and professional with them, despite the divide between our worlds, and it's worked well with most.