Re: Do you think Naruto Kai will ever be made ?
I don't think, if Naruto Kai ever happened, they would change the voices or music. Perhaps from part I but not from Shippuden.
I think they only did so with DBZ because it was quite old at the time. The first versions were aired late '80s and early '90s, while Kai was aired in what... 2008? Quite a difference, which Naruto does not really have that much.
Plus, DB/DBZ's soundtrack was really monotone (Japanese version). The brass orchestra and fanfare drums fit perhaps the older version but not the action-packed fast paced Kai version. Whereas Naruto (shippuden)'s soundtrack is perfect.
I honestly don't know why Funimation never put Faulconer's soundtrack with Kai, probably had something to do with licensing or whatever. All in all, I don't expect they would switch soundtrack or voice actors if they're all game. (Except Kisame's )