The final tragedy.

So I’ve been thinking about what Susie saw and what Ralsei doesn’t want us to see and I might have a theory. What if the dark world is like the dark hour in persona 3 and once it doesn’t exist anymore, everyone’s memories of it disappear. All of that character development gone in an instant. That could be why don’t forget is such a prevalent phrase across the game. I’m sure someone made this theory before but it just came to my mind