Of course everyone is going to have their own say and opinion on who should fill the role.
To that I say, great. However, the movie hasn't even started in normal production yet. Gal has plenty of time to get into really good shape (Hell she is fit already). I'm not saying she is going to beef up and get super muscular. She is a great actress already, she knows how to kick ass (she spent 2 years in the israeli army) and she has a lot of upside going into this role. Not a lot of people know who she is.
I'm excited for her, I think if she can pull this off, it will really be great for her career.