Hello. First of all thanks for the input blizzard, about time we got information regarding the server issues, Much appreciated.
To put things shortly.
If you manage to enable faction change i do believe alot more people will consider moving from the overcrowded servers as it open up more options to pick server to transfer to.
For example:
It allows people from Gehennas Horde to faction change to alliance and transfer to earthshaker that is an alliance populated server that could fit more people from my understanding.
Maybe allow free transfers with the option to also faction change for free if you use free transfer and move to a less populated server?
Maybe also consider cross realm dungeon finder for wrath of the lich king?
One big thing that makes me refuse to move server is the fear of having issues finding a group later on in wotlk when people quit for different instances and such as i’ve been in that position before on a decent populated realm, but once the expansion has been up for awhile people quit and it became hard to find groups, searched for a tank for almost two hours to magister terrace before i gave up.
Best regards.