JKD is a superior martial art in terms of a strictly fighting art. While it is essential that the most traditional of our arts evolve, lest they remain totally stagnant, they must evolve both at and beyond the physical. This is where (oh, strike me for I will feel the wrath the many) Bruce Lee failed (oh, dear Lord, why do I say these things???). He presented the physical art to his students, but eliminated the higher order of his art. He taught people to fight others, when he knew they needed to face their own inner demons to successfully eliminate their enemies.
Please, please, do not misunderstand me! He was the BOMB -- the best fighter (and the fastest) in the Universe, by far. But somewhere along the line he missed the point. He used his art to heal himself, yet he did not teach his students to be able to do the same.