As the news of Luffy’s exploits at Totto Land spread across the world, Neptune read about it on the newspaper and learned that Jinbe joined Luffy’s crew. Given Jinbe’s actions against Big Mom, Neptune planned to declare Fishman Island under the Straw Hats’ protection. As Shirahoshi decided to accompany her family, they were ready to depart for the Reverie.
Now we can combine this with Madam Shirley’s prophecy about the destruction of Fishman Island.
We may speculate that there’s at least a small possibility that Big Mom is gonna wage war to Fishman Island, which may lead to its destruction.
Another thing I’d like to point out is the purpose of Noah. Remember that huge ship that was supposed to carry the fishmen in the humans world?
My argument is: why there was the need of a ship for fishmen, given the fact that their natural habitat is the sea?
CONCLUSIONS:
- Big Mom’s gonna destroy Fishman Island
- Fishmen will be forced to move to the human’s world
- Noah could be their “new Home” at least for a while
ONE LAST ARGUMENT OF DISCUSSION:
All of this might actually happen while Shiraoshi and King Neptune are attending the Reverie.
Shirahoshi as we all know might be kidnapped too, leading to a huge problem for Fishmen and everybody else too (her being an Ancient Weapon).
*Theory by AName