You know what would be the a real cool beginning for a sequel movie?
The camera peers through a doorway into a large room much like the one in the finale in which Tony visited Junior. And just like that scene, it is a mental institution and one sees someone sitting in a wheelchair just peering out a window. The camera draws closer and and around the side of the person's head and we see that it is an older and decrepit Tony. Someone says "Tony, there's someone here to see you." The camera goes to the face of an elderly Carmela. The camera moves back and forth bewteen her and Tony and there's some conversation, then the camera moves in closer and closer on Carmela's face and the shot dissolves to her in her kitchen years and years before just like the old days. From then on the storyline is what happened post-Holstein's.