Unlike The Sims 3, TS4 is pretty good at keeping the town populated, in my opinion. There are more than enough new townies in each generation for my Sims to find friends, enemies and partners and to prevent the town from stagnating. There's a slight problem, though. Vanilla TS4 includes a population limit of 180 Sims. Since this includes dead Sims as well as living Sims, anyone playing for a long enough time will usually reach the limit, at which point the game will begin deleting any new Sims that enter the town, making the game pretty much unplayable.
The game is also programmed to "clean" the genealogy of your played households, meaning that it will also delete Sims that are distantly related to your Sims for no other reason than you haven't played them in a while.
This mod stops both of these forms of culling.
Mod Effects
This mod will disable the "Max Population" and "Genealogy Pruning" story progression actions, preventing any Sims from being deleted by the game. The game will continue to generate new townies even when you reach the 180 Sim limit and they won't be deleted, either. EA implemented these features to improve the game's performance, but as most of the Sims in your town are either dead and/or inactive at any one time, I don't see any notable consequences to disabling them.
