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I can relate to thatI dont think they know where it is, by the time roger became pirate king he was already sick and started to disband his crew so it speaks to logic that he would have let buggy and shanks leave the ship first because they were youngsters. Rodger gave shanks his hat because he saw promise in him as a pirate.
Only Rayleigh and some of the more higher up members might know what one piece actually is. I also believe that some one from Rodgers crew who got ejected before his big moment might join BB or will be after the location of one piece
Also we really don't know what Raftel is like yet, it may be a huge challenge even for the Yonkou's

Possibly, it's some place requiring you to master Haki to an insane level only a person worthy of Pirate king can get through...?
I'd love it if it's something like that
It'd also build up suspension on finally finding One Piece, whatever it is 
I can't stop imagining, it has to be a huge treasure of all kind of things from all over the world, which is the "minor" part of the true treasure... The lost weapons, secrets of the dark age, and possibly, something totally unexpected, but something really special, that only Oda can think of

---------- Post added at 08:11 PM ---------- Previous post was at 07:32 PM ----------
Thinking about it, One Piece is possibly consisting of things all the crew members will value!!
Lost history: Robin, lost history is complete and a lot of interesting and cool history is revealed of the void history / dark ages.
Lost technology: Possibly, maybe Vegabond has "some" of his skills and knowledge from the lost time..? Franky could uncover a whole new level of lost technology, especually considering Oda seem to introduce a lot of Robots, tanks and what not after Franky joined. Although I personally dislike this option.
Lost Medical books or similar from the dark ages: Chopper's crown for becoming one of the worlds finest doctors! Given his reaction in the Gecko Moria arc, he'd probably share it with the rest of the world though.
Gold treasure: Nami $_$ She LOVES treasures!! But also, they would never lack money when they go shopping again, although could see Nami sitting on the whole treasure and only giving them small portions of gold to buy for

Awesome weapons: Zoro would maybe find a really strong sword, or maybe even 2! He'd probably want to keep fighting with the katana he brought from his dead friend and rival.
All Blue: All the 4 waters connect, although think Sanji was drugged in love when he said all blue in the fishman arc (they're only halfway afterall), so it's likely gonna be close around Raftel and One Piece on the other side of the planet, my bets atleast
Possibly some recipies could be included in One Piece.Brook.... Honestly, I can't think of anything he'd like... All he wanted was friends to travel with once again, right..? In a way, he'd get what he wants by the others finding their treasures, a happy crew and happy friends!
Crazy inventions: Not sure about this one, but idd that there will be something cool for Usopp as well!
The crown of One Piece: Not litterally, but something truly amazing that will be fitting for Luffy. Perhaps, an amazing weapon or something similar that actually matches Luffy's style and fighting style.
Thinking about it, he'd need it if a war breaks out between the 3 super powers, he's forced to fight if he wants to remain the Pirate King.
Though, I doubt the crown piece of One Piece is a weapon, perhaps there will be two things for Luffy, or well, who knows, Oda is the master!! Surprise us

Just some quick theories, take it with a grant of salt

Personally, I don't think the manga will "end" when Luffy becomes the Pirate King. His journey ends, but there will be a last thing to do, the world will probably end up in chaos between the 3 powers, and Luffy will have trouble having a peaceful time as Pirate King.
He enjoys adventures, but doubt he'd like chaos though.
The reason being his father and his army, something big is going on...