My thirteen year old's prediction for the final book
 

He predicts that Harry Potter must die to destroy Voldemort, because in effect, Harry is a horcrux. We will see a reunification portrait of his parents, Syrius and Harry at the end, together with Dumbledore.

I thought it'd be cool to see Harry awaken in an ordinary high school, realizing he doesn't need his dream world of magic and then to be killed by a lorry.

I hope Harry dies a failure. That would be cool.