Agreed.
Timer or no, there wouldn't be enough housing, even if you removed grandfathered houses or nuked inactive or undersized FCs. The two things have little to do with each other, in a sense. That's why I think it's pointless to come up with band-aid fixes. We need Ishgard housing to come out, and we also need additional servers or whole DCs to compensate for a playerbase that is likely to increase come the new expansion.
As for instanced housing, they either lack of resources or willingness to expand on the apartment system. While it would be a perfect solution to our problems, that requires SE to want to go that route, and they like their silly neighborhood system.
To a certain point, I think that repeated suggestions are just venting; a lotto system wouldn't add enough houses, instanced housing has been seen and ignored, refused or worked on (would be nice to get more info on those islands), badgering about FCs and grandfathering is just as pointless.