What about an island ending? Some heroes sail to a tropical sanctuary and live happily ever after? This could be the best possible scenario for the group, a final reward after an all-out bloodbath with an adversary. Islands and zombies are tricky, however. Just ask the characters in Dawn of the Dead or Zombie Island.
Regardless of all the many, many theories floating around out there, it all comes down to one inevitable ending, one neither you nor any of the show's other fans are going to be happy about. It's no fun to imagine that nobody makes it out alive, but the extremely compelling evidence for the idea is outlined below.