i'm sure people would argue,but...
I am currently in the jkd pipeline of Inosanto's,but i don't see why not.I think what Bruce and many others who i respect are really trying to say is that it doesn't matter what styles you get things from as long as they don't own you.I would guess wing chun was a popular pick due to the chi sau and the concepts that go along with it that aren't as integral to other systems.I think the whole idea is to come up with a series of movements that flow into each other in progressive form using the least amount of effort to produce maximum results(end of fight).Following this line of thought all the concepts come into place such as no mindedness,centerline,mirroring,immoveable elbow,etc.I don't see a reason why you couldn't do the same thing with any set of styles that were complimentary to each other,but i do see the limitations of certain styles.Of course most of the karate styles i'm thinking of can be done more "flowing" and without a forward reverse punch if you had the presence of mind to soften things up.Personally i think wing chun is a good core system for anything,but i admit i'm not an expert and i think it will take many,many years before i can probably feel confident with most of my techniques.A few problems i see in many martial arts is the choppiness.I don't need to punch and ki-ai(however you spell it) and admire my work.I would rather flow into something else and get things over with.Another problem are styles that are rooted and think they can take a good grappler out with a snapping front kick or simply sidestep them with a mortal combat move.Unrealistic at best.As long as concepts of the arts you study don't interfere with your personal way of fighting or common sense i would think anything can be jkd.JKD to me just means a coherent system of fighting that covers all the elements and can flow like water or crash like a wave when it has to.A balance of hard and soft techinques,striking,trapping,grappling,and an emphasis on sensitivity and body control(both you and your opponents).This is a lot to cover,so it's only reasonable to expect to spend many years when trying to cover all the bases.I guess i'm trying to see it like i see grappling.I was a wrestler,i now take jiu-jitsu.I don't call myself a wrestler or a bjj guy,just a grappler.I wish people would start to view the stand up portion of the arts the same way.
-Devildog