Oh man, just think of the fallout, how they wouldn’t know how to behave around each other. If it’s Dean who’s unrelated, what about his love for his mom and the worship of his dad? And if it’s Sam who’s unrelated, you just know he’d blame himself for Mary’s death and ruining all their lives.
And what about everything that came before it? How are we supposed to interpret their co-dependency now?
What about that soulmate business? Before you could explain that it was only true because they were brothers, but what if they aren’t?
I mean, how many fangirls do you think would start shipping it? How many would stop talking about how disgusting it is?
Suddenly you have to go back and go over all the eyebrow-raising moments and realize that everything is now infused with homoeroticism.
But then again I sort of don’t want that because the incest makes it hotter.