Nami has already mapped all the areas that she has traveled, and it can be assumed that she will create a world map once the story is over. At the end of the series she will be the best navigator of the world.
Nami is already a smart woman, capable of manipulating the weather to a great degree. With Zeus, she’s going to be a truly fearsome opponent!
Her final bounty will reach at least 500,000,000 Berries.
Soul King Brook was the real MVP of the Whole Cake Island even if we do not know yet if his bounty has increased or not.
I think his final bounty will be about 600,000,000 Berries also due to the fact that he will be one of the strongest members of the King of Pirates’ crew.
Somewhere later in the series, closer to Laugh Tale possibly, Chopper realises that Luffy is dying from the very same disease as Roger did. He then dedicates his time to try and save Luffy, suceeding by finding ways to cure this incurable disease.
The World Government will realize the real power of Chopper and will begin to see him as a serious threat and not just a pet.
His final bounty will reach about 600,000,000 Berries.
Franky is the strongest crew member after the Big Four (Luffy, Zoro, Sanji & Jinbe).
At the end of the series Franky will have fulfilled his dream to create and travel with a dream ship which would experience countless battles, can overcome extreme hardships and can reach the end of the Grand Line.
His final bounty will be at least 700,000,000 Berries.
At the end of the series Usopp will be a brave warrior of sea and the best sniper of the world. As a Commander of the Pirate King he will have a final bounty of at least 800,000,000 Berries.