After Harry's next visit, he will most likely not have any reason (or desire) to ever return to the Dursleys'. Rowling has already said that there's more to Petunia than meets the eye. Hopefully it will explain why they kept Harry all that time when they hated him, and he was always inadvertantly causing horrible things to them (Aunt Marge, Ton-Tongue Toffee, Dudley Demented). But, anyway, unless Petunia suddenly rides in on a broom and kills Voldemort herself, I'm thinking her part of the story will have to come in at the beginning, which would be right after the end of the 6th book.
After Harry's next visit, he will most likely not have any reason (or desire) to ever return to the Dursleys'. Rowling has already said that there's more to Petunia than meets the eye. Hopefully it will explain why they kept Harry all that time when they hated him, and he was always inadvertantly causing horrible things to them (Aunt Marge, Ton-Tongue Toffee, Dudley Demented). But, anyway, unless Petunia suddenly rides in on a broom and kills Voldemort herself, I'm thinking her part of the story will have to come in at the beginning, which would be right after the end of the 6th book.