If you're a Tolkien fan and have 15 minutes to spare, this is definitely worth a watch. I had no idea that he had started writing a sequel to The Lord of the Rings.
Like the video's narrator—and as much as I'd have loved to have found out what happened after the end of the LotR—I think I'm happy that he didn't pursue the idea any further... it might not have been a Star Wars-level mangling of the franchise, but it would probably not have ended well.
Having said that, the core of the story does show that Tolkien seemed to have a pretty clear view of human nature... I'll leave it as an exercise for the watcher to draw the parallels between the outline of the story and some of the things going on in the world today.