If the Island Sanctuary includes a new housing implementation then that'll be super cool. But my fear and suspicion is that this is going to be a FFXIV implementation of FFXI's Mog Garden. But I am hoping it's more Stardew Valley like too and with a customisable house to go with it.
With regards to a 1 house per account implementation. I am curious how this should work as far as FC leaders are concerned, I would say 1 personal house and 1 FC house per person, it does mean people could still abuse the system and get 2 houses, but it's better than being able to have many. This would affect me because I am an FC leader and we have an FC house, and it's for the FC, heck I barely even touch the design myself and it fits around the theme of our FC and many chipped in a lot of work and gil into the house, so it'd be really s**** of me to claim it as my own. But I also have a personal house, which I use for something different. Both get a lot of use and I am not trying to abuse the housing system.