So in conclusion I'll mention my results after a month. First of all, I feel good about it, and I never intend to go back to warm indulgent water. I feel like I got rid of an unnecessary comfort, second after about two weeks I felt like going back to warm water but the power of habit had already kicked in so I stayed with cold water. Third, Like mentioned in the article, the panic response to cold water is gradually going away, and soon I'll probably notice it flow into other areas in my life.
So I think It's a quick and effective way to develop discipline and even self esteem. I would recommend this habit especially to high school kids who bear the brunt of mass marketing from large corporations selling useless products.