When Naruto becomes licensed...

[ZeaLitY]

Well, Cowboy Bebop had the benefit of like-sounding characters and roles that were easy to fit. The coolness of Spike worked with smooth talking on either side of the Pacific; the problem I perceive with Naruto is, we're going to have screaming kids and whatnot, and it's just going to sound retarded to us. If it were Jounin and up, it'd be better, but imagine Naruto speaking in English in a different. "AHM GUNNA BE HOKAGAY N U CANT DO NUTHIN!" "H-WHAT" "OH-KAY!"

[ShinobiNeko]

Angry Gumball, I know for me it's not exactlly that I heard it in Japanese first that made me not like the dubs, actually there are a number of anime I saw the dubs first, but then I watched the subs, and totally liked the subs better. To me, dubs just don't carry as well as the Japanese ones do. Yeah there might be a *few* exceptions but to me in general, the Japanese voice casts usually fits the characters better and act a whole lot better.
So I don't think that it's exactly that people are biased because they saw the Japanese first, think it's more that the Japanese do a better job. I can point out one example. I watched Fushigi Yuugi dubbed first, and I really didn't have a prob with the dub, I think that's one of the few dubs that I actually don't hate @_@ , but either way, I got the second season on DVD, and watched the subbed version, and totally liked it better.
But on subject, highly highly doubt that a Naurto dub would be any good, same goes for One Piece dub as well, for that matter. Like I stated before, Naruto has such unique character personalities that I think certain voices would match and work well, and most of the time, that's not what happenes in dubs, and in general lacking emotion, on top of that, I would not be surprised if they turned around and made name changes -_- and used some lame stuff like 'art of the doppleganger' for attack names