Problem with this is Wano is merely the conclusion of a 10 year plotline. And by itself is a nearly 3 year arc with no signs of ending.
Then you have to account for the 2 remaining Yonko aren't the only factors, but the Marines, World Government, Revolutionaries, Vegapunk, etc. Then you also have to account for the fact that Bonney and Urogue are the 2 remaining supernova without genuine focus. Then you also have to account for the idea that probably all supernova and SHF members will be relevant in the conclusion.
Then when you factor all that, then you can add Elbaf, the 4th RP, Lodestar, Laugh Tale, One Piece, Void Century, Rocks, God. Alley and so on until your brain pops from trying to process on how Oda is going to finish it all.
Tbh, I think post-Wano will take another 10 years. I don't think it will ever be Oda's intention, but as long as he's motivated in drawing, I don't see him rushing his story to the conclusion. There are far bigger plot points than Wano and everything the last 10 years has built up to. In fact I think finishing 10 years will be a challenge for Oda. That's roughly ~400 chapters from this point, to which may or may not achieve everything he's going to do.
It's a GRRM situation, when you make your story too big, sometimes the conclusion is so big that it becomes the biggest portion of your story ironically. I almost can't expect the final arc being anything less than 200 chapters, and thats 5 years by itself.
Maybe I'm setting myself up for disappointment, but considering how long we are going to still be in Wano, I'm not so sure I'm wrong on this expectation