Stannis’ arcs

Stannis’ arc from ACOK to ASOS was to become from the king Westeros deserved for its stupidity in the nobles to the king Westeros desperately needs in the face of the Winter-creatures.
Now sadly Stannis’ arc from ADWD to TWOW will be to realize that being King of Westeros =/= Hero of the World, even though he is fit to be and will horrifyingly prove it, only for it to be worthless. However, I thought about something, and I know GRRM said he would not end it in “Westeros became a wasteland, but Essos got lucky, the end” to paraphrase it, but I thought on how much horrifyingly fitting would it be if Stannis has to sacrifice not only his only child, but ALL WESTEROS (supposed someone would give him the means) to decide “Kill Westeros to keep humanity alive”, it would be an interesting choice from a dramatic literary viewpoint where, to keep the role of hero, he has to commit the worst crime possible from the viewpoint of his original position, the position from which he accepted Melisandre’s service in the first place, to help him being the king, initially caring nothing for the hero thing, except as a little booster of self-esteem. Your thoughts?

I don’t think scale is necessary for the “worst crime imaginable.” Rather, I would argue that it’s intimacy that acts as an intensifier, while sadly scale often de-sensitizes. 

Hence my theory as to where Stannis is ending up.