Will and Elizabeth are obviously the main characters next to Jack but I think it's unrealistic to expect Hot Toys to ever make them again. Maybe if Inart had the license we'd see figures of them but I doubt the couple would sell as well as a Barbossa or Davy Jones.
My hope is that Hot Toys listens to the hundreds of people asking for a Davy Jones because he would be the most visually striking figure out of all them and quite frankly I'd be happy to call it a day on Pirates just having Jack and Davy.
Just imagine a Davy with SERS, cloth clothing with the sea life done in a similar fashion to the spider man and superhero suits along with some sculpted parts, his base could mirror Jack's facing the other way and have the Dutchman's helm with some Kraken tentacles coming out of the water. The accessories would be fairly simple, the dead man's chest with his heart and key, Calypso's music box, Norrington's saber and maybe a telescope.
Davy would also be the easiest one in terms of licensing since he doesn't have any likeness rights attached to him and can be licensed based on the franchise itself not any specific movie as has been the case with some of his most recent figures. Hopefully Hot Toys is listening.