Allow me to point out what instanced housing will never bring a player...
This screenshot I took of my message book it not to boast or brag. I don't even have any idea what would constitute a high number of likes and messages. I am posting it for a couple of other reasons:
The first is I don't know 597 players. Not even close, let alone talk to that many players. I think you can like a plot more than once, but I digress.
The second are the comments. I can only show one tab, but I have 3-4 tabs with comments about my home. I put an astonishing amount of time into my place, and it was finished long before message books were even available. Each and every single one of those comments made it all worth it. It also makes me wonder how many players have actually stopped by that I don't know about.
To know people have came and visited my plot, loaded into the house, looked around, loved it, and left me a comment, and did so completely unsolicited means so much. I can't even describe the elation that is felt. If housing was instanced, like so many players feel they want and would make things better; this would not exist. I would have this home I've spent hours on, and nobody can see it. It just exists in this little tiny corner in cyberspace. All by itself.
Might as well put instanced housing in Ultima Thule. That would be a very fitting zone to have them.