Literally the only way they could make housing reasonable for the average player would be to make the game add new wards as they fill up...
But from what I hear, all the extra data from that would eat up the server machines quite the bit more than likely causing other isssues.
Just gotta be happy with the apartment... Maybe if they gave people who own Stormblood the ability to buy a second one in Shirogane, that'd be something.