It is sometimes possible.
Have you tried the suggestions listed in the article. The first thing is obedience training. After enrolling in classes you can also choose desensitization and counter conditioning.
In one of her book Patricia McConnell describes an aggression problem in a young Border Collie. The dog was eventually rehomed to a family that lived in an isolated location. Once his stress was relieved, his personality improved.
Change is possible, but not always a sure thing. I definitely think it is worth trying everything you can.