And if Oda's die?
You start a manga because you want to write about vikings, but you need to set up some places and characters before getting there. In doing so, the manga earns a lot of success, so your editor tells you, "Hey, why not take a detour? What's all the rush with the vikings and the end game? Take it easy, let the world breathe." So you agree, add a few arcs in between, stretch your story. Now it's twenty years later and you're finally--finally!--starting the long-awaited viking saga, your childhood dream come true, when all of a sudden--
--your heart gives out.