In 5.0 there was a point where the player has the option of going to Eulmore to meet up with Alphinaud, or going to Amh Amaeng to meet up with Alisae.
SQEX later mentioned they did this in order to divide the server load in a place where they saw potential for something like Raubahn EX to happen again.
They're def conscious of the issue and working hard to try to circumvent it. As for what tricks they have in store for 6.0, we can only guess, especially since (as I understand it) they've been addressing this problem on the back end too.