Ginobili became a popular name in NBA last 2011. That was his peak because everyone knows him for his greatness. In regards with his question, I think he can still be a good coach. Once a basketball player mastered all the skills needed for him to be great, he can surely influence other players to strategize too! If he will choose to be a coach instead, I don't see any problem with that at all as long as he puts his heart and mind into it!