You have done everything like a garrison for toon’s like Hunters, warriors etc.
You have done covenants for toons.
You have done lodges for classes.
But have not done anything for guilds like a lodge type system where everybody in the guild can meet like a inn with a hearthstone with banking and repairs like a lodge for the guild. (guild Lodge)
This could work very nice for when a realm becomes overcrowded and two 3rds of guild members agree to move to another realm you could just move the guild and members in it, to a lower realm by just moving the whole lodge and guild.
This would lower the crowds in the inns and city areas a central meeting place for raids etc.
A portal to a major city for access to other questing areas