They announced how worlds would be shuffled.

[Vahlnir]

If they installed AFK kickers like they did before, we would of never had this problem to start.
The AFK kicker helped tremendously and should do that every time an expansion begins.
They took too long to implement it on SB, like 3 days. Should of done it from the start
if they learned anything from HW launch. Kinda sad because of congestion that people
are forced apart like this when there's a fix for said congestion.

The AFK kicker helps a bit, but it's not the solution. Upgrading server infrastructure is. Getting people more spread out across multiple servers is also helpful, and they've been doing that for some time.