so what do you think will cause luffy to destroy fishman island?
Tbh, I think "destroying fishman island" is sort of a hyperbole. I think at some point, the gov might go after the princess, forcing the fishman to relocate. Luffy will "destroy" the island to cover for them. They've always wanted to have an island above the sea anyway, so I think that would be luffys motivation. Protecting the princess and helping them move lol
I don't think they're corrupt since they're literally are the first and strongest group to try to make a change
The government and celestial dragons, though I think there might be a very small percent of celestial dragons going against the rest on the low
I have this feeling that the three will one day meet each other and maybe fight together, but I also think garp will die trying to protect luffy
Speaking of celestial dragons, I think there is nobody or group from Naruto that are as evil and cruel as the celestial dragons
I see two scenarios where SP and Kishimoto will change the ending
One is they're not making as much money as they hoped they would(one can only false advertise and bait fans for so long)
Or they're trying to reboot in the future
It's possible they are somewhere. I think it's just a part of Oda's theme, in the sense that the world is a blob of gray, and that it's really hard to differentiate between good and evil.
I think that if there's a split in the world government, it comes between those tht believe in Akainu's justice and those that believe in Aokiji's justice (ie Absolute vs Moral justice). At the conclusion of the war, I believe that Aokiji would take over as the Fleet Admiral with Smoker as his admiral.
Madara, Sasuke, and Danzo would have been as bad if they had been at the top, but that's it. OP has
real villains, which Naruto lacked (except Obito, he was a real villain

)