I agree with you here. After talking with other parents and reading the first book myself, I let my eldest son read the entire series as each book was released. I think he owns all the books. Some were gifts. He won one in a contest. Then he spent his own money buying the final book.
As someone said on another thread, it is pure evil that Rowling hid the information and waited until her last book was sold to reveal this news. I’m sure kids are going to hear about it and spread the news. These days, it may be made into an issue in the movies, too.
Of course, my son also read Narnia, LOTR, and other books that are pure good vs. evil, so he’s not a Potter-obsessed fan (anymore). I’m now glad my other two children are not early readers who like big, thick novels.