By 2015 the population of Paris should have stabilised, each district having evolved differently.

Central districts should loose one out out of five inhabitants while all those on the outskirts absorb the rest of the population, the only exception being the 16th district.
The structure of the population’s age should also develop unequally, bringing about different needs for infrastructures and services.
The very young population should remain stable. In this context, establishments for infants would need to be more flexible, in order to accommodate this section of the population. On the other hand, there should be more older Parisians throughout the territory necessitating that the housing and services offer be developed.