The Sleeping Sword

This book is so good apart from one crucial point - at the end of Bun's story he has his character (himself) regain his sight. I can understand that he wouldn't want to be blind, but this ending to his story presents his blindness as something that needs to be cured, and yes, while it would be preferable to Bun for him to be sighted, what sort of message is this to another young blind person? That the only proper and happy ending to a story about a blind kid is where he stops being blind, something that these children most likely would not be able to do? Wouldn't a book where a child learns to be content and happy while blind be a much better message for other blind children, and not fall into the common ableist trope where the disabled character has to be ‘cured' to be happy?
Had this one small aspect of this book changed, I probably would have liked it a lot more. :(