AOC plans on having a dynamic world with each server being different, eventually server populations will dwindle and servers will need to be merged. Starting a new server and moving both server populations to it and having the players duke it out might be fine if the node system ends up having as high of a turnover as they seem to indicate, however just losing everything you've built but keeping your resources won't be any fun, so what if you designed server merges as planned events, set several months out, tie it into the lore, make it an apocalyptic event like. Maybe something like monster coin, 3 months before server close the server close is announced and a server wide apocalypse begins initiating mass evacuation to the divine gates. The players can start caravans to bring mats and other stuff they want to keep through the caravan system they are already designing. Then you have players surviving while defending their caravans as they make their way to the divine gates to join the new server and you also give some excitement to the end of the server.
Think about what it would be like, the clouds ashen, fissures opening up across the land, your guilds caravans bumping across the once smooth road. An eerie silence permeates the air pierced only by the occasional sound of wildlife being extinguished by the monsters plaguing the world.
This allows a more fun transition to the new server and gives opportunity for looters and opportunity for players to struggle against hordes, which we all enjoy