An HP fan theory. Does it make sense?

A foreign friend and I are big fans of Harry Potter. We actually met at a certain fancon and from then on, we became good friends regardless of our distance. We keep talking about our what-ifs of the book and the movie and we actually came up with a theory that Harry Potter is now immortal. Originally, the prophecy said that the only one who can kill Harry is Voldemort and the only one who can kill the latter is the former. However, now that Voldemort is gone, is there a reason for Harry to die according to the prophecy? Does the theory make sense or it is just probably our imaginations going wild?