I agree, I owned a house and didn't think anything special about it, I don't know why anyone would.
What for airship stuff or submarine stuff? Really could care less about that content, I can un-sub anytime I want without worry of the 45 day and losing a huge chunk of gil used to buy that house, to take breaks to play other things and experience other stuff save a bit of money and maybe later return at a later date.
If I were Square Enix, I would of just gave everyone their Gil back, built upon apartments, put balconies for gardening and make a place for birds like a inside barn that keeps a persons chocobo for leveling and coloring, remove all outside furnishing free up some data and make submarine and airship stuff connected to the lobby where anyone can do that stuff.
Because every time a problem happens they are going to shut down home demolish and face it there will be more than one time this is going to happen and I believe that housing is a failed project, nifty idea at first but it to me is just a ploy to get people to stay subbed to the game due to the fear of losing their house.