I guess there is no answer, just in case I'll ask and maybe you guys have interesting theory. So the game ends with all of the group dead, Ardyn dead forever and Noctis and Luna saving the world and restoring the light back. So the Lucis Family is extinct with nobody to take over the Kingdom, same happens with Tenebrae (or do they just choose a new Oracle? Is an Oracle needed anymore?), and Niflheim. So we have a world where Altissia is the only nation with a leader?