The part where the Dursleys leave. Dudley says that Harry wasn't a waste of space and leaves, followed by vernon. Aunt petunia stays, looks at Harry and opens her mouth as if she was about to say a speech but leaves instead. Does anyone have any sort of idea what she might have said if she actually spoke? I don't know why it's always been there at the back of my head.
J.K. Rowling: The Dursleys are reactionary, prejudiced, narrow-minded, ignorant and bigoted; most of my least favourite things. I wanted to suggest, in the final book, that something decent (a long-forgotten but dimly burning love of her sister; the realisation that she might never see Lily's eyes again) almost struggled out of Aunt Petunia when she said goodbye to Harry for the last time, but that she is not able to admit to it, or show those long-buried feelings. Although some readers wanted more from Aunt Petunia during this farewell, I still think that I have her behave in a way that is most consistent with her thoughts and feelings throughout the previous seven books.
Nobody ever seemed to expect any better from Uncle Vernon, so they were not disappointed.
I'm typing from my phone and it wouldn't like me edit it. All above is a quote from JK on the matter. Sorry it's two months late, hope it still interests you (:
I also feel like it would have been a little lame if Aunt P suddenly did something out of character. I felt their was progression with Dudley, at least.
Honestly thank you so much!! I'm really glad there was actually an answer and I can get that question out of my head. I guess it was the right thing to do in order to keep it consistent.