Also, I don't bet on more arcs than Egghead, Elbaf, Lodestar (if this is even mandatory), Laugh Tale, and Corkwood, the last of which is a piece of the Red Line south of Reverse Mountain. Are we getting Mary Geoise, Corkwood, or both?
Actually never heard of Corkwood, interesting. I think Elbaf will be next and will take up around 1,5-2 years, I don't think it will be as long as Wano or Dressrosa and will revolve around meeting the Redhead pirates, getting more lore in and setting up the ending. I also don't think that Lodestar will be necessary, as it isn't really a place of interest. After Elbaf, Laugh Tale should come, and I always imagined the final arc to be a journey through already visited locations, as that would tie together a lot of things. Final confrontation could the on the Red Line at Mary Geoise or as you said, on Corkwood
But that's all just my baseless theory, just how it would make sense to me. I expect the story to end in the next five years, with the final arc being fast-paced
Edit: Actually, I still believe in the theory that Laugh Tale is on the bottom of Enies Lobby. If that's the case, then from Elbaf, the strawhats could sail around the grand line again and visit old locations, after they get to Laugh Tale, they could sail around the grand line again to reach Mary Geoise. They could pick up their allies and create their final fleet through this