@Ivotas Oda mentioned in the recent Aoyama interview that the series would end once One Piece is found.
It makes sense when you think about it. The Final War will be the fight for the title of Pirate King, so One Piece can't be found before that event. It will be the reward to the winner, with stuff like the Dawn and the fall of the Celestial Dragons being consequences of the war itself instead of whatever OP is.
The implications, thus, are that Roger's failure to bring change to the world were mostly due to his lack of access to the ancient weapons due to timing reasons. The OP treasure then just becomes something that may answer a driving question instead of a tool of some sort.
We will likely not see Luffy fighting the WG as Pirate King officially.
I see. I guess that does make sense. I guess never considered that all three ancient weapons are timing based not just Poseidon. Still would like to see some sort of aftermaths. It's what I always enjoy after a big arc.