I think there are 3 solutions to housing in terms of available plots.

1. In game process that adds more wards automatically depending on active players.

2. Add more worlds, atm according to Lucky Banco Census 2 new worlds to every current datacenter I.E. Aether gets 2 new worlds/servers, Crystal gets 2 new worlds/servers, Primal gets 2 new worlds/servers.

3. Instanced housing - although this goes against what Yoshi P has said in the past about housing feeling like a neighborhood of people.