It's not really surprising. They went too far with her during the blackmail plot; before that she was a believable soap bitch with a humorous side, now she'll always be remembered as the monster who blackmailed a grieving elderly couple even after their beloved grandson was horrifically murdered.
The future of the Carters is looking increasingly shaky now that three of them are going. We're going to be left with Mick, Linda, Shirley, Tina, Sylvie and Johnny. I think a Sylvie announcement will be incoming soon as her current position in the square is untenable due to her deterioration in her condition. Tina and Johnny's futures are crucial to the survival of the family. If they axe both of them, especially Johnny, then it's a clear sign that SOC wants Mick and Linda gone when the contracts come up for renewal. There is a very real possibility that all but Shirley will be gone by Christmas next year. On the other hand, SOC may simply want a scaled down version of the family and has no plans to axe any other members. I hope it's the latter.