You would actually have to be some kind of genius to successfully adapt One Piece into a live action TV show. The strong points of the story depend on a pace and set of tropes unique to manga and anime. Most faithful adaptations of Luffy to live action would result in a character that acts like a retard. Stuff like the river flowing upward would land in the uncanny valley of CG if it isn't done perfect. The villains are highly tendentious and their posturing and unique laughs would be extremely cheesy. How is Zoro supposed to fight with 3 swords and not look horrible? How do you even do Luffy's rubber powers and not make a visual abomination?