I'm pretty sure that SE has a very good idea of what players might have been impacted by that. It's not hard for them to pull up a list of accounts with active subscriptions that have addresses on file in the affected areas.
Before any more start with the "SE only cares about those in Japan", maybe you should take a look at the timing of the demo suspension on the JP servers earlier this year. The flooding in Japan started in at the end of June and kept escalating until the rains finally started to die out on July 9th. It wasn't until July 30th, 3 weeks later, that SE announced the suspension of the demo timers.
If it was a knee jerk reaction just because the flooding was happening in Japan, they wouldn't have waited until 3 weeks after the flood waters began to subside to announce the suspension. They were trying to see just how many players were being affected in the long term before deciding if they should suspend the timer.
Have faith they will follow the same procedure for other major disasters around the world, including the current and recent hurricanes in the US. They did suspend the demo timers last year when they felt there were enough players affected to warrant it. They will do the same again this time if enough players are actually impacted.
The sad truth is most who come in here going "Look, a natural disaster! Suspend the demo timers for my region" aren't affected by those disasters, do not know anyone affected by those disasters and don't even care about those who are. They're looking to turn misfortune suffered by others to their own benefit.
Instead of worrying about demo timers, how about worrying about the real life health and safety of those affected instead? That's far more important than some virtual house in some video game.
Which makes such dramatic concern over something in a video game even more pathetic.
People need to stop obsessing over the status of FFXIV houses and start thinking of the people instead.