Jinbe will be offered a country for fishman and make fishman slavery illegal to CDs by the gorosei in exchange for Luffys head
Maybe Jinbei being alone at the end of Wano banquet that he was suppose to share with the SHs and celebrate his joining like Luffy promised, was "subtle foreshadowing"?
Nah but seriously Jinbei has done WAY too much for Luffy and sacrificed himself far too much, even incurring the wrath of Big Mom towards himself and Fishman Island anyway due to his loyalty to Luffy.
Jinbae/Jinbro for a reason.
if Jinbei legit was a traitor, I wouldn't even slap Oda with a fish. I'd set up some Saw type contraption, some conveyor belt, assembly line shit, so he's helplessly slapped by tons of fish all day long at least.
Thar would be a really interesting possibility if Jinbei wasn't so loyal to Luffy. Something more pragmatic/realistic. The SHs have experienced "betrayal" but not something as extreme as this too either.