Players database in the future of a savegame?

Hi all.

A quick question regarding starting a new savegame.

When I play I always play long career savegames, which means I prefer a database with many players. However, I like the game to be as quick as possible. So, if I start a new game with only 2-3 divisions (to optimize game speed) I won't have a big database of players... That would be fine to begin with, but what about the future? Will the game expand the player database if I add 7-8 leagues after let's say 3-4 seasons? If so; will the players added mainly be regens?

Or should I just start the save with 7-8 leagues instead of just a few?