When asked about what is the titular "One Piece" treasure, he was asked by the host if the treasure was "family bonds", Oda replied that he hated that kind of thing, in which he elaborated, "That's like the ending of The Wizard of Oz, which I watched when I was a kid. Adventuring that long, and having the adventure itself be the treasure, is really dissatisfying. Those kinds of stories are impossible. It feels like, 'I've gone on this long adventure, so give me the treasure!'"
As of July 2016, Oda revealed that he finished around 65% of the series and as of this writing, the series has released its 91st volume last December 4, 2018 in Japan.
[Source: Anime News Network]