I think Eos does not need another King. The empire is dead as well and the scourge of the stars ended with Ardyn. The world is at peace, that is the silver lining after the tragedy. Even the Main Screen changes to light and the music is more positive sounding
Unfortunately that is also at the expense of the players loss
In some ways, I left the main story feeling like I sacrificed something also to bring light, which is a really nice feeling in some way.
Despite all its flaws, its the first game in years that inspired such feelings on me. I love it!