Since interiors are instances, they could add areas that are full instances.

I understand people who want to keep wards but considering how areas are dead empty, SE really should consider to add instances that are not wards.

How to access these plots? Islands (sea or floating), NPC or central aetheryte, there are many possibilities.

It even would make possible to upgrade from a little house to bigger one, depending of the in-game incomes or crafts.