Not a chance in hell.
I thought this idea both was held by few and mostly long ago during simpler times in the story.
But no apparently it's the second most popular idea for what the One Piece will be.
That's a whole lotta WRONG people.
I mean I have my personal horse I'm backing, Rio Poneglyph and all.
But I acknowledge other ideas such as various different material items and some stranger things.
But there is no question what it ISN'T, and it sure as hell isn't going to be "A NOTE FROM ROGER SAYING I HOPE YOU ENJOYED THE ADVENTURE :)" or "A MIRROR FOR LOOKING BACK ON THE JOURNEY AND YOU AND YOUR FRIENDS" or "THE JOURNEY IS IT'S OWN REWARD".
You disagree? Well apparently there's an awful lot of you who would.
Bring it. Defend your concept that would be lame and a let down in a Dora the Explorer episode, let alone friggin "my brother just got violently skewered and died in my arms" One Piece.