The same argument could be said when the faction turns into an entirely mono-faction. You have the freedom to join the population managed SOD or the freedom of not managed versions where mono-factions have appeared on their respective realms.
Your subscription grants you access to the game, nowhere does it state to a specific faction/server and no refund will be given based on that.
Edit: I understand you want to play with your friends/family, you could always suggest they add in systems or another to enable but I think there’ll be always people left behind in any given system.