Isn't there a limit to how many characters can be created on a world? If it's a supply issue, eventually they will get to the number of characters that are available per world.

They just need to remove FC housing and make all FC leader's personal house have the option to have all the features of an FC house.

Also, they can either empty all the houses and have everyone start fresh in 6.0 with one house per account or they need to restrict those who have multiple houses so they cannot transfer any of their houses until they only have one house.