I want to encourage a minor faction that I support to expand into a neighboring system. That system has a Coriolis port and can be useful to my supported faction but the neighboring system is *packed* with other NPC factions. Can someone guide me to a forum discussion about what can be done to evict one of the NPC factions so that my supported faction may choose that system during another expansion effort? I understand how I can drop a faction's influence in a system but what criteria needs to be met for them to drop out of a system altogether to make room?
https://forums.frontier.co.uk/showthread.php?t=193064
This is the best thread about the BGS I believe.
As to your question about removing a Faction, I believe it won't happen until you have expanded into all possible systems within a 30Ly limit before removing factions will happen.
Ask in that thread though, and I'll happily be corrected in my understanding.