Is One Piece ever ending?

Yes, "One Piece" is expected to end at some point in the future. Eiichiro Oda, the creator of "One Piece," has stated that the series is currently about 80% complete as of my knowledge cutoff in September 2021.

The series has been ongoing since 1997 and has surpassed 1000 chapters in the manga and 900 episodes in the anime. However, Oda has indicated that he has a clear plan for how the story will end and has been steadily working towards that conclusion.

It's not yet known exactly when the series will end, but Oda has stated that he wants to finish the story in a way that is satisfying for both himself and the fans. So, it's likely that the series will continue for a while longer before eventually coming to an end.