Based on early speculation, Jake Sully may very well die in Avatar 3, and if he does, there are several characters who will become more important.

Avatar 3's Darkest Jake Theory Sets Up An Incredible Payoff 16 Years In The Making. Avatar: Fire and Ash may bring back a battle between Quaritch and Jake Sully that dates back to the original ...

Jake Sully. James Cameron’s ‘Avatar: Fire and Ash’ trailer debuts at CinemaCon. James Cameron’s “Avatar: Fire and Ash”, the third chapter in the legendary sci-fi saga, ...

James Cameron keeps teasing Avatar 3's evil Na'vi clan and 'brave choices' and I think my boy Jake Sully might be cooked. The Wind Traders sound like chill people though.