They will most likely start with forced daily logouts like they had in Stormblood. They kicked everyone off the game at like noon and then opened it back up so people could log back in. Annoying, sure. But it worked wonders kicking people out that were using ways to get around AFK timers.
If it gets bad enough, I can see them delaying OCE servers and using that hardware for NA. Presumably, they have one datacenter for OCE so that could add another to NA. If it's two, they can add one to NA and one to EU (which is also suffering if I remember). This honestly is probably their best bet. We don't have any idea of when the chip shortage will be over and EW is going to cripple the existing servers if the load isn't spread.
