Many things you listed are a self-propagating. They result from having so many people in Ul'Dah. Better question, why did so many people come to Ul'Dah?

-Best leves
-Most guild halls
-Most convenient layout
-CENTRALLY LOCATED IN THE WORLD

They are already addressing the first point, and in discussions about the 3rd point. But im wondering how they will address the last point. They cant just move Ul'Dah. Also, we can assume that new classes will have their guilds in LL or Grid to try and balance that out.