Server population at the start screwed the game from the get go. BW over expanded servers and now stuck with tons of light servers.
What I can't understand is why MMOs use "servers". What I mean is there should only be 1 server with multiple instances. That way there is never any I picked the wrong server at launch because everyone is on the same server. So with multiple instances, you can still join friends for WZs/Raids/FPs/Questing and don't have any of the downsides or completely isolated servers. Not to mention there is no need for server mergers or transfers to think about.