Re: My take on what the bounties will be after the Dressrosa arc
Don't forget, that once your bounty goes over 300 mil it raises a lot slower. In other words Luffy's bounty wont go up by more than 100 mil if you ask me.
The bounty alone does not say anything about the strength of a person!!! It says much more about, what he has done. Luffy had a bounty of 400 mil after taking part in the war at marineford (and mainly for creating the huge ruckus at impel down).
These are actions he only played a minor role in, yet had a huge raise in bounty for it, because it was major incidents for the navy. My point is, Eustass Kid had a higher bounty than Luffy before reaching the new world, because he was killing innocent people that weren't even pirates, just because they laughed at his dreams.
So I don't think Luffy's bounty will have a higher raise than what it had, after the marineford arc. It's simply not possible for Luffy to deal that great damage to the marines at the place he is in right now.
For the rest of the crew, it depends a lot, on what type of battles they end up in. It's not like Chopper's bounty raised despite him beating one of the members of CP9. It didn't raise, because nobody noticed, and the island was destroyed by the buster call, killing all the evidence. So again it depends, if there is evidence of it.