Reposting this here since my thread just merges my last post so no thread bumps:
Greg talked about it:
He believes Oda means he wants the series to end here, however, the wording can be interpreted as "just this part of Luffy's story" (however Greg thinks rather its the whole thing, but Japanese words can be fun). Anyway, Greg himself goes onto say he doubts it (the timeline) due to
1. Pacing. Purely the fact that we are still in Wano and "that" War hasn't been initiated/set up/begun as of yet.
2. Chapter release. Frequent breaks will prevent him from getting there when he thinks (~200 chapters away)
3. Slyly tacking in another year. He said 5 years last September. He said 5 years in this volume. He just added another year lol.
4. 30th anniversary. Greg believes he won't NOT try and hit that milestone. (He may not even have a choice lol.)
5. Greg thinks the ending, from what he knows or once knew, is fairly ambitious (aka, Lots of plot/content/whatever) and doesn't think it will be achieved in a quick or swift manner.
6. Greg doesn't believe Oda is a prophet.
Anyway. I vibe with it. It all comes down to how Oda does it, or you can still reframe the argument to be made that "Luffys adventure to find One Piece is over, but that doesn't mean the story is over".
Idk, I'll slowly count down the years, and also see when the war actually starts/how it starts to properly guage if I can believe in Oda finishing when he thinks he will. If it takes us another ~40 or 50 chapters to finish Wano, then Oda brings us to Elbaf or some other unknown island next, without remotely trying to have the crew find the last RP, im going to doubt this timeline heavily.
Also, do note that Greg, being an OP columnist and someone who is relatively close to these people, has called Oda's "5 year" comment a marketing move. Take that as you will.