I agree. I believe that it was inserted to show the way that Michael's life turned out, which was so different from the one he had envisioned. He is longing for the way his family used to be when his father was still alive and in charge. Realize the amount of loss he has experienced: his parents, his two brothers and his wife. Granted, some of them were very much his own doing, but that last shot of him is so very sad; he is so alone.