Some how I predict that once Griffith takes over Midland, the story will shift 20 years later. I am sure most people remember that picture which shows Ishidro and Schierke all grown up and you get the impression Guts might be an old man since it only shows his eyes and white hair on the side. Anyway here's what I am predicting, darkness has ruled over Midland. King Griffith decides to spread his reach to Skellig island to destroy what's threatening him. Forcing Guts to come out of hiding and bring the battle to Midland. It sounds to me the story is far from over. I would say the story would be done in 10 more years.