I don't want to jump in and curb any enthusiasm you have for this idea, BUT..

There are costs associated with this type of system, programming etc. It is my belief some higher up committee within Square Enix is banking that the cost of implementing this idea exceeds what they are projecting as profit, or the profit is so negligible that this will not come to pass any time soon. They probably take into account "longevity" and up/down trends based on the current mmo market, and might have a "bad" feeling about investing in the housing system as opposed to trying to fixing the problems listed with healing/tanking as myriad threads are blasting off constantly and affect more people than those interested in housing.

That being said, I do hope they bring about some form of instanced housing that greatly exceeds what is available now with an Apartment. Even a larger "apartment" with no yard would please a lot of folks, but finding some way to implement gardening in these cases may prove to be difficult or impossible for whatever reasons they will pose. I've read somewhere that gardening was tied to the weather/day and night cycle withing the wards so it is not possible in its current iteration to be replicated indoors. (that is what I think I read). Best wishes and I hope you receive your wish.

~~Edit.. It would; in my opinion; be wise of them to clue us in more to what the end result of the Ishgardian Restoration will be.