I have to wonder how much Luffy's bounty will increase.
Considering that BB, after killing WB in Marineford, being the first person to get two of the most powerful devil fruits, and beating the remnants of the WB pirates, consisting of its 14 division commanders and 43 captains, and rapidly expanding his territory, he only received a bounty of 2.247 billion.
With that in mind, I think people may be setting themselves up to be disappointed if they think Zoro is going to get a bounty over 2 billion or something like that.
I could see guys like Sanji and Zoro getting bounties over 500 million, but I think it would strongly depend on what they did for their bounties to breach the 1 billion mark, especially considering there are so many other heavy hitters in Wano like Kid and Law.
I think that the blame is going to be widely distributed, just like it was in Dressrosa where Luffy and Law took equal credit for the defeat of Doflamingo.
In Wano, I think its likely that Luffy could receieve more credit, but depending on who gets the most credit beside him, for example, Law and Kid being seen as the next largest contributors, will affect much their bounties increase.