Should we expect others to grow as leaders?

I support the idea that you cannot demand one to be a leader just because you or someone else has such expectations. It doesn't matter whether a leader has become such because of his charisma or he/she was forced by particular events, more or less it is a personal choice - not everyone shares the same ideals and dreams so it will be unfair to have the same expectations to everyone. However, if one acts as a role model, I believe that the person shall grow as a leader since the environment around us is continuously changing so shall be the leaders.