The last chapter of the last book has allready been wirrten. So j.k rowling said in a tv interview but she hasn't written the books in full. I think That either ron harry hermione or dumbledore will die in the end. I dont think j.k rowling is bothered about weather the book is a happy childs tale. One perant who heard that hary will fall in love sent a letter to j.k to ask her not to make harry fall in love and just keep him innocent for the children to read. J.k wasn't happy and reminded her not to tell her how to write her books. All i know is the last word in the 7th book is scar. That could mean anything tho