It seriously baffles my mind that the developers up to this point have not moved in a direction of making housing dynamically scale or completely instanced. Given the structure and design of housing now a dynamically scaling system would benefit everyone.
I would propose the following:
1. When all original 12 wards and subdivisions have be 100% sold - a new ward and subdivision is opened and put up for sale.
2. New wards are created as long as 2 requirements are met - all original wards are 100% sold, and all previous dynamic wards are 100% sold.
3. Should a house plot become available in an existing original ward sales in dynamic wards are halted until the original ward is once again 100% sold.
The developers are have made excuses that they have memory limitations, which is just that excuses. Its 2017 - invest in more server space if you need to - these kinds of dynamic housing systems have existed in games since at least 1995 - examples include Dark Age of Camelot and Lord of the Rings Online.
Yes - development time would be required - yes that would mean less new content in the next patch, but at this point I dont care. MMO research and data by people like Nick Yee (google scholar him some day) have proven time and time again that the largest motivational factor for driving player retention in MMOs are the social aspects of the game - housing is exactly that for groups of player friends and guilds (FCs) and development time and money should be invested into making the housing system work for the community instead of the community trying to work the housing system.
A dynamically growing housing system would solve all the issues at present and would allow higher population servers to have the supply for the demand. The players have wanted it it since 1.0 its a shame that the system was never developed this way in the first place.
We also know the developers can do something similar to this because its exactly what they have done for apartments - which as much as they want them to be considered houses - they never will be until they ad something like a courtyard or a balcony that players can look out from and place outdoor furnishing.
Come on SE - time to step up to the plate and do some modern development.