I will fundamentally disagree with concepts of housing (houses) be just for the few or more older school thoughts that introduce weird system finagling and scarcity due to memory issues (not all old school stuff I think is bad but this would be one of them, I don't care for that scarcity mindset). For example this system is clearly inspired by systems like Dark Age of Camelot (very old mmo), I think literally, since Yoshi said he liked that game (enjoyed playing and the pvp experience if I recall correctly).
Although I would absolutely agree that the thoughts like "if it was only FC still" or "if it cost significantly more than it did now" would pull back on many of what people experience (but I think would still make people upset, just less 'immediately so', no placard issues, etc- and this lack of upset is if we assume they did it from the beginning vs now.. if they did it now I still think people would be absolutely pissed lol).
If only FC could buy houses and they costed 5 to 10 times as much, there would be massively less wards needed and probably far more likely to see people (FCs) use the house they invested huge amounts of gil (better neighborhoods). Yet they did try to get player housing and make it more accessible (as was the demand for it), as you said (they're using one system to do something it shouldn't do and are damaging things in general because of it). Another example of the system doing something it shouldn't is that each time they add wards, particularly as they add them equally, they increase the amount of dead / ghost town vibes - so the basically only major benefit to the system is compromised by trying to get a significant amount of people in at a lower bar.
Some people hear that and might think "so raise the bar" and that's fair in the sense it would do a ..thing.. lol, but to me that just says "the system picked was bad, fix up /other/ systems" (like making apartments upgrade-able into instanced houses).
So we might disagree on the ultimate functional goal, not sure lol, going towards that all get to experience it sort of concept, but I would agree that one possible way that we didn't have all the huge problems we have now is if they had kept housing out of many players hands. I don't think that is a good thing... but clearly their system is having massive troubles accommodating (having both is clearly failing all over the place lol). So I definitely agree in some of your premises, just want it to be clear that to me the end goal is every single person would and could get a home of ANY size or theme (and more, since I think instanced systems offer far more potential customization/power) and I don't fancy any sort of obtuse old school systems that require thoughts like "buy a house you don't want to get a house you do". Definitely of the crowd that if I buy something I get to keep it, like the house if I took a break, or even if I bought a theme'd area and changed I'd not lose the other theme (like a wildstar system).