It could easily be possible if they used Kuma's powers. That's the only way for Oda to showcase every island and allow the Straw Hats to go back to previous locations, like Fishman Island for Shyarly's prophecy or Marineford or Mariejois, and see the islands in the other four blues, but that would needlessly extend the story by another 30 years. The best way to show the OP world in full without dragging out the story is to either make a full sourcebook or make a video game or MMO that let's you visit all the islands and forge your own pirate adventure.
A proper One Piece MMO would be the best MMO of all time, IMO.
Microsoft Sea of Thieves Crossover could be very good, too.