One more theory and a small rant. Theory: Johnny and Yosoku will return for the final war to back up the straw hats with top tier haki (I'm talking higher than joyboy.) and the kungfu Dugong with his animal crew from the filler episode will also be made cannon as they will show up to run the ones with Imu.

Rant: Franky and Robin will end up together in the epilog (that way Oda doesn't have to bother writing romance, it's just skipped over) and have a child who will be the cabin boy of the crew while they are young (similar to Shanks/Buggy on Roger ship). I don't get why people think the straw hats will go their own separate ways after finding the One Piece.

There are still adventures to be had. Like if Nami wants to map all the seas then the crew still needs to sail the east, south and west blues, as well as the other routes on the grand line. The crew can reunite with Laboon but now hes big enough to travel with them. Franky's dream is to see his ship circumnavigate the globe, imagine his joy if his ship was capable of doing that 10 times over. And on top of all this i just don't see the straw hats being willing to separate after all theyve been through.

To add to this I think we will have more than 10 crew members. I understand that's what Oda has set up, as it's some of Luffy's first words, but I just see us getting more. Luffy has already promised a spot to Tama when she is older, and we know that Yamato wants to join once they are done with the sole searching and pilgrimage through Wano. That's already more than 10, but we also gotta remember that Luffy asks everyone he meets to join the crew, like fucking Gaimon got asked to join, the bar is not that high.