Up-and-coming competitors are a threat to the company, according to the analyst.Talk about a fall from grace. The once high-flying athletic apparel retail stock Lululemon Athletica (LULU 0.74%) is down a queasy 43% year to date. The slowing revenue growth rate the company revealed in its first-quarter earnings report spooked many investors, and quite a few remain on the sidelines.Among Lululemon's bears is one analyst who cut his price target on the specialty retail stock from his already low level. Was thi ...