YOU AGREE THAT YOUR FFXIV SERVICE ACCOUNT AND ANY VIRTUAL GOODS AND CHARACTERS DO NOT HAVE ANY MONETARY VALUE. SQUARE ENIX MAY SUSPEND, TERMINATE, MODIFY, OR DELETE FFXIV SERVICE ACCOUNTS, CHARACTERS, VIRTUAL GOODS, OR THE SERVICE ALTOGETHER, AT ANY TIME FOR ANY REASON OR FOR NO REASON, WITH OR WITHOUT NOTICE OR LIABILITY TO YOU.

this is how it's typed out in the user agreement that everyone agrees to when they sign on to the game, they very well can and SHOULD take away houses from people who own more than one based on the rules they are about to put in effect.