Holmes, Sherlock Holmes. JK Rowling should take note. Doyle killed off Holmes but had to bring him back by popular demand. Look for more tales of Harry Potter, Ministry Auror and new Leader of the Order of the Phoenix.
-PJ
That said, even though that is the end of that story, the world is so rich that she can do several more books in that setting very easily, and possibly craft a separate series of books with new or established characters. (There are enough Neville fans out there...)
TS