User blog comment:Akali95/Kuma's Nikyu Nikyu no mi/@comment-3181121-20120219122657/@comment-4605926-20120219214301

That's right but he can't just implement some weird things like people starting to use magic and stuff, you know what I mean.

Every series has its own logic so if Oda comes up with an idea that really doesn't fit, he wouldn't implement it (I hope not), at least not in One Piece.