IF this happens it gives shueisha a free pass to prolong the story even more because the main limiting factor -Oda's finite life span- would be removed
If it happens, jump wouldn't risk the societal outrage by pulling a stunt like that.

Look at berk. After Miura died, Koji Mori took over and has said they're only doing the most barebone stuff to finish the story.

I'd imagine oda has also explained the ending to his family/friends. At least some of them. So they'd easily recognize artificial prolonging of the story.
 
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