To me, JKD concepts are like a "finishing school" to MA. I don't believe Bruce Lee intended for people to shun traditional training methods (if he did he was a fool, cause that's how he got trained), he just emphisised moving past structure and form to a point of self-expression.
I like to use the music analogy on this. To learn music, first you learn theory and structure, along with the physical ability to play an instrument. As skill and knowledge are developed, the individual learns to break and bend rules to achieve artistic expression (becoming formless).
This is, IMO, the path of all good martialists. Too many misguided people find a JKD school thinking they will learn a style, but they are givin a handful of techniques and a lot of theory/philosophy, I believe you need to learn form before you can develop formlessness.
Sapere aude, Justin.
The map is not the Terrain.
"Wheather you believe you can, or you believe you can't...You're right." - Henry Ford