I really like the ideas being thrown here and am pretty open to these ideas as wild as they may be. The airship idea is fun and brilliant, I'd love to have an airship

I think that if they would permit people to relocate without essentially re-purchasing an entire plot, it would make a huge difference especially if it's only permissible to wards that have a lot of open plots. The problem with the ward system is that almost nobody cares to visit different wards to see what houses people have, it's typically only just friends or FC mates. Additionally, wards become empty very fast or full very fast. I remember being one of the only 3 in my ward for months until they stopped demolition.
Another problem with wards is that you can't have your entire FC move to said ward, I mean you can but it would be difficult to accomplish. I assume there will be two more housing locations in stormbringers; Ishgard and Ivalice or somewhere around there. With the the demolition timer re-enabled, it will be very empty until we get hundreds of thousands more WoW refugees, but even then I don't think their servers can support that many people in a single world so it might be empty regardless.
Also I think some people here are misunderstanding what I'm suggesting. You won't lose your house, and you won't get relocated anywhere with my idea. You would simply merge everyone on plot 21 or whatever and there would be a list of say 40 people sharing that plot. When you approach the sign in front of the house, you can change the instance and the house will fade into another house.
But, as Shougun said, they might not be able to do that due to software limitations in their engine. Something absolutely must be done and more wards will not help. The demo timer should be gotten rid of and an earlier post had a good suggestion about how to deal with this. BUT, they are relying on the demo timer for monthly dues because people don't want to lose their house or well, mansion if that's what they have. You don't just lose the house and lot, you lose all the items in it. My cottage has over 100-200mil worth of items and a lot of it can't be obtained anymore. At some point when I will want to take a break for a few months I will have to figure out how to store almost 400 housing items. :P