Was that her exit then or will they be coming back and then she will leave? If she leaves then Jacob has to leave, only way it's likely he stays is if she's the one killed off in the summer as there's no way she'd part with him
I agree, as much as I love the character the only feasible way that she could exit is by her dying!
We've seen the strength of her and David's relationship in the Lachlan story, if they can get through that there is no way they could split up over a move to Portugal!
Also I don't know if Jacob is staying on the show, but there is no way that Alicia would even think about leaving her son!