Personally, wild speculation incoming, I think maybe that's why Amy Hennig moved on, creative differences on the tone of the story. At it's core Uncharted is a light-hearted adventure in the Raiders of the Lost Arc and Star Wars (congrats to Amy BTW) vein. Will we ever see the death of someone who really matters within the story? It would be heart-breaking for Sully or Chloe to die. If Elena kicked the bucket I think people would lose their minds.
Ugh I just want some more info, is that too much to ask?
PS. Yes the OP was being silly, I'm taking this seriously, it's serious business dammit.