This fashion innovator is struggling to win over investors.It's been a difficult ride for Lululemon Athletica (LULU 2.77%) investors this year as shares have cratered some 54%. The business that singlehandedly created the athleisure apparel category is facing slower growth and heightened competition that is undoubtedly scaring shareholders.But Lululemon's bulls hope things can turn around for the better. With that being said, where will this consumer discretionary stock be in three years?Doing the same thin ...