J.K. Rowling is releasing a new Harry Potter book soon, and fans have been getting their hopes up that Daniel Radcliffe returns to the role in a future movie. Daniel himself has said that it's not the right time yet, but he doesn't rule it out eventually, pointing to what has happened with Star Wars.
So can we take that as a 'yes, maybe'? I think so.
As an author myself I can see the appeal of the Harry Potter books, and why fans want more and more of it. But I actually think that many of the actors would want to move on by now. I would, if it were me. You know, they have a life too, they are not wizards and witches in real life.