Ben convinces Walt to leave with him and brings him to a Dharma van waiting outside with the new man in charge—AKA Hurley—inside. Hurley tells Walt that the three of them are going to return to The Island because that is their home, and they still have work to do.
So here we have a ready-made Lost spinoff. In the flash sideways purgatory, Hurley and Ben converse in the finale, with them telling each other that they had made a great number one and two. But what was the work that still had to be done, that needed Walt’s aid?