I think we might get systematic bounties raises on Wano kinda like we did on Dressrosa.
The way the arc is set-up with so many allies etc. I think it makes the most sense and would be easiest way for Oda to assign bounties post Wano without having to give it too much thought as there are a shit ton of characters.
So my estimates would be:
For beating a Yonko solo - 2bil raise
For beating or stalemating a Yonko in a tag team or with help - 1.5bil raise
For beating a Yonko high executive solo (i.e Yonko commander) - 1bil raise
For beating a Yonko executive (i.e Tobi Roppo, Peorin etc.) solo - 500mil raise
For beating a Yonkou executive (i.e Tobi Roppo, Peorin etc.) in a tag team match-up or with help - 250mil raise
That considered, my Post-Wano bounty predictions are:
Luffy: 3,500,000,000 (+2bil raise)
Law: 2,000,000,000 (+1.5bil raise)
Kidd: 1,950,000,000 (+1.5bil raise)
Zoro: 1,520,000,000 (+1bil raise + 200mil for leaving a permanent scar on Kaido 🤷🏾♂️)
Sanji: 1,330,000,000 (+1bil raise)
Killer: 700,000,000 (+500mil raise)
*Jinbe: 638,000,000~938,000,000 (+500mil raise)
Jinbe might not get a 500+ raise depending on how high Who’s Who’s bounty is. Plus his bounty is already pretty high.
General Franky: 594,000,000 (+500mil raise)
*Yamato? - 500,000,000 ~ 600,000,000 (if she does indeed join the SHs). Reckon it’d be somewhere around Ace’s & Sabo’s
Usopp: 450,000,000 (+250mil raise)
Robin: 380,000,000 (+250mil raise)
Brook: 333,000,000 (+250mil raise)
Nami: 316,000,000 (+250mil raise)
Monster Chopper: 250,000,100 ~ 500,000,100 (+250mil ~ +500mil raise) - Drake might hype him to oblivion so 500mil~ish won’t be surprising to me
*Carrot: 250,000,000 ~ 500,000,000 (+250mil ~ +500mil raise) - reckon she’ll get a bounty regardless of whether she joins or not. Would be super dope if she gets a bounty higher than Pedro’s tho ^^