One, I don't think T&T and Disney would do something as ridiculous and retarded as to make Will so F*CKING STUPID and marry Elizabeth on his death bed. That's so F*CKING RETARDED!
She wouldn't marry a dying man, even as a favor. No one wants to be a widow, man. Besides her feelings for Jack would over come the little voice telling her to make Will happy in his last moments. She knows that marring Will, whether he would die in a few minutes or not, would mean she is bound to him. Fully.
But she's a pirate at heart, she doesn't want this. She needs to feel like she has some freedom, she's already been there fantisizing about sailing the seas, she's dreamed about pirates and swordfights. She's been there. Why go back?
Elizabeth wouldn't just give up, in my opinion, they might leave it as a semi-cliffhanger. Jack and Elizabeth would sail off into the sunset, even as the East India Trading Company hunts them down, they'll have each other.
Together, they'll run. If they perish or not, they'll be together. I don't think Jack would ever want to go back to normal civilian life, with the woman of his dreams or not, he can't go back. Elizabeth wouldn't, couldn't and won't go back to that horrible lie in Port Royal.
Jack set her free, why the hell would she return to the cage? All this talk about kids is getting to people's heads. In my mind, there is not kid. No 'anchore' to hold Jack in place and keep him alive. That's not living, " What the Pearl really is, is freedom..."
The Pearl is a ship, Jack's ship. He sees it as freedom to sail the seas, to go beyond the barriers of a normal human. That's his greatest dream. To be truly free, even though he gave up his Pearl, would he not want it back? Jack is not a truly unselfish guy. He could change, sure, but it's impossible to change completely. Even if you spend years trying, you'll always have that little bit of yourself hidden away, where no one could see.
Jack won't let this part of him die, he won't let Elizabeth go back to her prison. They'll fly away, break free.
Sail.