he will die if he doesnt have a change in life though..the change is having someone to protect in a dangerous new world IMO..It will save that person he protects and it will save himself..
the only time I ever see jack show true strength is when he's doing something heroic for Elizabeth.
Jack will die quickly if he reverts back to his old ways of having no one there to protect but himself..its logical because his old way of life was cowardly..and cowards die first in danger do they not?
Jack makes a huge contrast in movie 2 at the start and at the end when he decided to go back for Liz? He's fighting for someone he loves so that is why we see "brave jack"