Sally was a fill-in presenter for Emmy Kubainski when they were both at TVW in the early 2010s. I think she would better stay with fill-in weather and WS. Sarah Cumming is good, but I don't really like her on news and prefer her to stick with weather as well. Angie is much superior IMO and has got what it takes to anchor a bulletin well.
Sadly, like @TV.Cynic said, the current line up isn't too bad ratings wise, and I doubt they're gonna do anything about the presenting line up on weeknights anytime soon.