I really can't see Jac or Sara replacing Elsa, because it's like others have said, they have already started to do some mainline, and it's time to move both of them up to mainline, so it wouldn't make sense for one of them to replace Elsa. Just like with Elsa, they are too good to be stuck behind in Pink for much longer. Maybe Josephine could replace Elsa, I would say Kelly, but they seem to have skipped Pink with her for some reason, just like with Martha. I am not complaining about Kelly or Martha skipping Pink, because I love them, but it's almost unfair to models like Elsa, and it's made replacing her harder. I think Xenia could also be a good choice to replace her, but I don't know how likely that is.