Lordaeron was once a great Alliance capital and bastion of Human strength, but since the scourge diseased and killed the citizens of that once great empire, it has become a cesspool of undead filth.
Since technically those lands belong to the Alliance in the first place, should Blizzard create a story arch of the Alliance retaking Lordaeron, purging the Undercity and re-building the empire once again?
It might make for a good storyline to have the undead permanently relocated to another land, possibly even pushed back to their Horde bastion in Orgrimmar. Maybe there is a way to cure the undead? Could be a great expansion story line.