Macabre, absolutely, plausible, I think so. I agree with KenK though, and would add blood loss (even with a turn-a-kit) as a huge risk.
What are ‘you’ willing to do to survive is a useful mental exercise? I always try to keep in mind that being in one of my hypothetical worst-case scenarios would be almost infinitely different though. A friend of mind has said that he wouldn’t want to live through anything that would require him to eat another person. Me, I figure, human is probably the other white meat;)