That would be insane! I would love to see a call of the dead 2, as it is based of the whole movie idea and most movies have a sequal. So Call of the dead 2 would be amazing.
Could happen... If Sara, Michel, Danny, and robbert wernt killed by the blasts... Perhaps time travel if they were...
Or perhaps if it was the main characters who try to produce a documentary warning someone about the zombies and in an attempt to get help, a possible easter egg being broadcasting the documentary to all remains of TV's and Radios. We know there are TV's in from Nuketown so perhaps another team somewhere may see this and then they will be involved in the next map pack.