I don't entirely see that as an issue. As people will likely be leaving the world as you come in to rejoin your static. So, I can see houses opening up on worlds as people keep shifting around till their static is together again.
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There will be total chaos for sure when it's implemented as I'm reminded of the server merges in FF11.
Leviathan too. Population is heavily lopsided on NA servers so they probably want to bust that up (for good reason). I expect a lot of pain and complaints when the details are announced. It sucks when your friend circles are broken up so I hope SE is ready to ease the pain if they try to even out the population by shuffling the servers around. The community might not recover if they handle it poorly.
Levi isn't in Aether though, the main problem here is Aether, it has quite a few thousands of players over Primal.
https://www.reddit.com/r/ffxiv/comme...a_113/e8yyamz/
5 of the 6 top populated servers are in Aether, also neary every Chaos server is more populated than the remaining aether/primal servers.
What you should expect for aether is that at least 3 of those 6 top servers will be moved to the new data center to balance the load. Lower pop servers don't necessarily have to move if they plan to add new servers to the new dc.
With chaos they only have to move the top 3 and mix it with new servers and the load should be fine.