If Ellen leaves the 表示する I would want it to be like her and her family ie Derek Zola and bailey, decide to start somewhere new または they get a new job etc just so that it's a nice ending for them. If the 表示する ends I would want it to be like the notebook ending where Meredith has her Alzheimer's like her mum and Derek has been telling her the story of their life and she remembers it and him etc and that be the ending scene,