@BellisarioFaith:
I've seen some guesses on Oro Jackson (where I made a similar thread) that Luffy will die. If he does, he sure as hell better at least become Pirate King first, because otherwise that would be completely depressing. I'd rather he live, though. I'm hoping that he and his crew, when they learn about the Void Century, do reach a "different conclusion" than whatever the Roger Pirates did, as Rayleigh said they might. Along those lines, I also hope that Luffy avoids sharing in Roger's fate and lives a long life.
As for the rest of them, I can't think of one in particular that stands out as having a much higher chance of dying than the others. Yeah, some of them are weaker than the others, but that didn't stop all of them from making it this far.
The most epic thing would be Ussop to sacrifice his life for the rest of the crew, thus getting even for all the times he had to be saved and at the same time fulfilling his dream of becoming a brave warrior (there's no bigger act of braveness than giving your own life).
But yeah, i can dream.
Jinbe is not going to die. He's joining the crew, and the delay doesn't mean anything in regards to that. The plot reason for the delay was for him to break off ties with Big Mom first, but the best out of universe explanation is that the Straw Hats needed to proceed into the New World and grow a bit more before adding the more experienced Jinbe to their crew. Now that the crew is going to confront Big Mom in some form within the next few arcs, he'll be joining relatively soon.
You're most likely right, and Luffy will probably save him for some poetic justice on everything Jinbei did in Marineford; He dying after that would be even more uncomfortable to read.