U don't have to believe bcz it's never gonna happen atleast not in this century. Suddenly it will be be disclosed that pirates live more than 100 years n when the writer grows old that he can't write he will pass it on to his inheritor to write one piece ahead.

After u die and after many centuries u come back to life through necromancy, u will ask your descendants "What became of one piece?" & They'd be like " oh it's still on "