To be honest, I don't see being happy with her even if she wanted to come back. I know I would try for my boys, but I really can't imagine getting back to a place where I could see her as my wife.
I don't believe it would ever work unless she was seriously willing to work very hard to change herself.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!