This would be one route to go down. I suppose I should clarify: a proper response would involve a promise to get rid of the current* demolition system as soon as possible. FFXIV, by Yoshi-P's own admission, is not built around continuous play, particularly for people who have dozens of hours a week to commit to a game. It stands to reason that game systems should avoid punishing people for sporadic subscription drops wherever possible.
I'd point out too, that most Wards are currently dead as-is. I can count on the fingers of one hand the number of time I've seen people in my little corner of The Lavender Beds since I got my house, which was about a year and a half ago now. The current demolition system likely contributes to this issue, actually, as players who are 'effectively' not playing nevertheless maintain a subscription and house for fear of not being able to get one back upon their return.
For the same reason that they maintain character levels, mount and minion lists, Mog Station items, Glamours, etc: if returning players have little incentive to resubscribe, then the game's bottom line will suffer. Speaking personally, if any life event pushes me to abandon my subscription long enough to lose my house, I'll most likely never be coming back. It is a significant in-game possession for me; in many ways *the* most significant since, unlike character levels or gear, a house sits outside the progression treadmill. It's not in SE's interest for a short-term break to turn into a permanent subscription loss.
I'm curious as to why you think demolition is desirable, by the way. I agree that it's necessary right now from a supply limitation point of view, but there are better ways of maintaining populated wards for those who want living neighborhoods (as I said above, I strongly suspect that the current demolition system actually worsens this issue). Thoughts?
Edit / Addition:
I think it's fairly privileged statement to suggest that players be able to keep their housing if they have a life event that impacts their available play time (injury, sickness, etc.), but not make allowances for players who have financial circumstances arise that force them to cancel the subscription outright for a period of time. I certainly will always be able to afford XIV personally, but I know many people for whom that's not always the case.