Here's how I see the show ending:
Walt decides to make a huge confession to everyone, and books himself, Skyler, Walt jr, Hank, Marie, Jesse and Saul on an exclusive boat trip. It's meant to be a just a six hour tour, but a storm hits and shipwrecks them on a deserted island, where they all have to learn to get along and find a way to get rescued. This will be the beginning of a new show, called, "Breaking Bad II: Vince Gilligan's Island."