A point that some reviewers have made (and that you here in Elecktrum's interview on AsCast) is that Susan chooses her path. She does not abandon Narnia, but, as Animus recently described, "took a different, later train."
This is PART of it. It is also one of the biggest challenges of the story as written. If Susan is frivolous and stupid, it's easy. If Peter is overbearing and pompous, it's easy. The hardest one, the challenge, will be to present it as one where once Peter and Susan hash it out, you the readers walk away 1) divided; and 2) pissed at both of them. This happened in the decision of Asim to not tell Peter that he had seen Edmund. Readers were pretty evenly divided with some seeing that Asim was right to stay silent and others saying rules be damned, Asim owed Peter the truth. That level of uncertain ambiguity is what I am aiming for.
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This is PART of it. It is also one of the biggest challenges of the story as written. If Susan is frivolous and stupid, it's easy. If Peter is overbearing and pompous, it's easy. The hardest one, the challenge, will be to present it as one where once Peter and Susan hash it out, you the readers walk away 1) divided; and 2) pissed at both of them. This happened in the decision of Asim to not tell Peter that he had seen Edmund. Readers were pretty evenly divided with some seeing that Asim was right to stay silent and others saying rules be damned, Asim owed Peter the truth. That level of uncertain ambiguity is what I am aiming for.