@Gia:
As much as I'd love for this to be the case, I can't see how this is possible with the sheer number of plot points Oda has reminded us of in the past 100 chapters alone:
- Shanks and Blackbeard and their crews
- Im, The Gorosei and the WG
- CP-0
- Akainu and the Marines
- The Revolutionaries
- Vegapunk and the SSG
- The "former" Shichibukai (especially Kuma and Mihawk)
- The Underworld (literally introduced new Underworld characters in WCI, still has brought up the subgroup in Wano)
- Level 6 Impel Down escapees (hasn't been mentioned since DR but I'll leave it here)
- The Strawhat Fleet
- The Supernova (especially Bonney and Urouge)
- Former Villains (Moria, Crocodile, Enel, etc)
- Elbaf
- Lodestar
- God Valley/The Rocks incident
- Laugh Tale
- All of the pertinent mysteries ( One Piece, ancient weapons, WG National Treasure, Joy Boy, Ancient History, Will of D, etc)
- Saving Fishman Island from Destruction
- Strawhat Dreams
Unless Oda can resolve everything at breakneck speed or not at all, this feasibly cannot all be resolved in that timeframe. Unless Oda plans on spending less time characterizing Blackbeard, Shanks, Im, Akainu, Vegapunk, Dragon and more outside of the last 2 major Yonko that have received 200+ chapters of backstory and arc focus (and we are STILL expecting more from them in terms of Rocks and Yamato), the timeline does not inherently add up.
Ask Bleach fans or Game of Thrones fans what happens when you short change an ending to a big story. Hell, Bleach barely had a story and that manga still needed another year or 2 to resolve all of its plot. So no, in my opinion ending OP at all in the next 5 years isn't even remotely feasible from a storytelling perspective, unless Oda plans on not elaborating on plot points he's promised for years with vastly more important characters than Doflamingo, Big Mom and Kaido (the only 3 current villains that have received focus the last 8 years). Its not even about the villains, there are many major protagonists and allies that still require further characterization.
People can say I'm in denial all they want about the manga's pace or ending trajectory, but in the end we will ALL lose as a fanbase if Oda rushes post-Wano.
I think you're ignoring the human element. Oda wants to end the story soon. Maybe he's short changing how soon he can do it given the breaks and such, but he's been doing this for a long time and is ready to end it. This is his story and he knows better than anyone the ways he can conclude it, including how he can conclude all of the different story elements.