On each world, why not just remove the 2 apartment buildings for each of the 18 wards on all four housing districts, and just make 1 massive apartment complex set up in well lets say Ishgard, which can be readily purchased by a player having finished all requirements for owning a house/apartment.

Apartments in this system will offer a more wide vertical and horizintal customizable apartment space having an outdoor instanced balcony (like the one in eulmore upperdeck), which follows in game time and weather, and allows large scale gardening. The apartment courtyard will be massive (Like that of the wide crystarium open space going to the crystal exarch's occular), with all sorts of npc merchants, mb, and summoning bell, as well as function areas for in game events and player sponsored events.

The housing districts and ward system can still be continued as somewhat a rare resource for those who want to compete for a plot. Hopefully housing districts will also have big improvements to its neighborhood aesthetics.