In contrast to the original, Justin Kurzel's 2015 adaptation of Macbeth does not end with Malcolm giving an optimistic speech about cleaning up the mess that is Scotland. Instead after Macbeth was slain by Macduff he is just sitting dead and alone on the battlefield while a young boy wanders towards him, apparently Fleance, and grabs Macbeth's sword from the ground. Parallel to this Malcolm is sitting in the throne room, looks at his sword, then at the crown and then walks out of the throne room. And the movie ends with Fleance walking, then running away from the battlefield.
It is a bit unclear what exactly to make of this. Now of course we have the prophecy that Banquo will supposedly be the father of kings, a prophecy that is never picked up in the play itself. I remember to have heard that at some point in history the line of kings can indeed be traced back to Banquo (and Fleance for that matter), but I don't exactly know how Banquo's supposed ancestors actually came to power. All in all this rather dark and mysterious ending sheds a much less optimistic and concluding light and I'm not sure what really to make of it.
So, what does the ending want to tell us? Is this related to the actual history of how Banquo's ancestors came to sit on the throne (if that is even more than just a rumour)? What does Fleance taking Macbeth's sword signify here? And why does Malcolm leave the throne room after looking at his sword and his crown, is he maybe even chasing after Fleance? Was something similar done in any previous adaptations or is it maybe adressed in any secondary (or historic) material? Or is there any information from the filmmakers about the choice of this rather ambiguous and less optimistic ending?