I'd say it's probably more close to near 20 more years of content, even if Oda's editors don't want to admit it. Here's what I'm picturing:
Whole Cake Island arc/Germa 66 arc - Big Mom and Luffy initially clash, Sanji's dad betrays Big Mom and she teams up with Luffy to take him out.
Reverie arc - Kings from around the world and gather to discuss the state of the world. Seeds of an internal split in the WG are planted.
Wano arc - Luffy has an encounter with Kaidou, but ends up fighting the Shogun of Wano instead as the final villain of the arc.
Mariejois arc - Kaidou w/ crew heads off to Fishman Island after learning about Poseidon from Caribou. Big Mom wants to protect Fishman Island (as does Luffy) and they backtrack to it. Huge fight between Big Mom and Kaidou occurs on top of the Red Line, in the Holy Land of Mariejois. Luffy destroys the entire thing destroying Fishman Island to stop the war between the two Yonkou. Kaidou mysteriously disappears in the rubble, presumed dead.
Elbaf arc - Final Road Poneglyph location. Luffy encounters both Jack and Edward Weevil here for the first time (Jack and the Beanstalk analogy). Huge fantasy-based arc that will also be connected to the Giant Jack of Skypeia and the Treasure Tree Adam. Also inspired by Norse mythology hence the Viking-like braids on both Jack and Weevil.
Vegapunk arc - Luffy and co. need Vegapunk's help to get to Raftel due to complications. Vegapunk tells them the history of Devil Fruits and tells them the key to understanding how to get to Raftel is via the Moon.
Moon arc - They go to the Moon, encounter Eneru, and Luffy faces off against a One Piece version of Freeza and becomes Space Pirate King or something.
Return to Impel Down arc - Luffy returns to Earth, only for the entire Marines to surround him lead by Akainu. He gets captured and is scheduled for execution at Impel Down. Sabo comes up with a plan to break him out. They break out, and this time Luffy defeats Magellan.
Second Paramount War arc - Decisive war between Revolutionaries and Marines occurs here. All Revolutionary commanders are revealed, including Zoro's master being one of them. Revolutionaries win and take over Marine HQ, freeing the Strawhats. Also a split in the Marines lead by Fujitora occurs here.
Pirate's Island arc - Strawhats make a pitstop to the place Roger got dubbed the Pirate King that is said to be gained from winning a Davy Back Fight. Luffy encounters the Kidd Alliance here as well as Shanks, who is guarding or protecting something (maybe Roger's egg). Huge conflict occurs, and Kidd manages to kill Shanks. Luffy beats Kidd to a bloody pulp and the Kidd Alliance breaks apart. Blackbeard crashes the party, defeats a tired and bloodied Luffy taking the location of Raftel away from him as well as possibly whatever Shanks was guarding.
Raftel arc - Via intel (Aokiji) the Marines learn about the location of Raftel. Huge war erupts here between every party, and the true history is learned in an extensive flashback arc. Luffy defeats Akainu here.
Throne Wars arc - The conflict arises when Blackbeard declares himself to be Pirate King, discovering the One Piece before Luffy does. More Pirates from across the world get involved, including a returning Big Mom and Kaidou (the later was thought to be dead) to join the fray. Longest arc in the entire series and is the final battle to determine who becomes Pirate King. And of course, Luffy beats Blackbeard and obtains the One Piece.
And then after that the anime continues on and produces it's own, original arcs about Luffy's descendants, lolololo