One piece will most likely be the part missing of history.

maybe just Roger's treasure like Shank's hat is Luffy's treasure? or even just a memoire of something he had of Ace, his only child (as far as we know) lol.

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At the end of the grand line is the true location of the one piece treasure. It's actually on sniper island......In your heart, lu lu la la lu.

i bet One Piece is the journey everyone had till they arrived at the island 😀

lol maybe it would be funny if at the end of the road, where there is supposed to be the legendary treasures... there's a sign that says "congrats, you managed to come here in one piece"
nah, but If we talk serious....I dunno, Odacchi is playful, but he is a genius that made this manga so great --'. One Piece could be either of these two tough: Treasure as in thing; and Treasure as in deep meaning whatsoever.. Or, maybe both at the same time

I believe that the one piece will be the legacy of D, or D's Will. I bet that D is a person from that great civilization mentioned by the scholars of Ohara. He probably is the only person that stand up against the World Government during that time but lost and left his legacy behind. However, that is found by Gold D. Roger in the last island in the Grand Line.

If one piece actually ends up being all volumes of the manga (knowing oda, he'd probably do it), thatd probably make my life.

One piece will most likely be the last piece of information needed to know what happened in the gap. or the gap itself. But then again im repeating myself 😛

I think it's a huge-ass piece of continent that used to unite everything until something caused everything to sink.

My 2 cents: It will be in a treasure chest and we won´t see the item and only the reactions. Think Pulp Fiction. The take away will be a message about friendship and how the mythos of the mystery item brought the together. They will leave it for others to find and mostly disband on their voyage home which we won´t see much of.

I also read EU/US comics and am a librarian.
Manga-Masters, My ANN-Lists + Imdb

i think one piece would be a sandstone on names of those would be written who have completed the journey all around the world and with a reference of another adventureful journey.

and knowing luffy he will definitely give it a try 😀 😀