Now that we have seen the bounties of the Topi Roppo, there is a clearer measuring stick for the crew in predicting their bounties post Wano.
Bounties for the crew after Wano my predictions:
Luffy 1.5 billion>Kaido 4.6 billion> Luffy 3.5 billion
Zoro 320 million > King 1.39 billion > Zoro 1.694 billion
Sanji 330 million >Queen 1.32 billion > Sanji 1.33 billion
Yamato 550 million (+550) *her first bounty, matching Ace’s
Jinbe 438 million > Who’s Who 546 million > Jinbe 638 million (+200)
Robin 130 million > Black Maria 480 million > Robin 530 million (+400)
Franky 94 million > Sasaki 472 million > Franky 494 million (+400)
Ussop 200 million > Page One 290 million > Ussop 300 million (+100)
Brook 83 million > Brook 283 million (+200)
Nami 66 million - > Nami 266 million (+200)
Chopper 100 berries > Chopper 100 million (+100) *If Chopper gets a real bounty, if not-then it will be 150 berries instead
Edit: Forgot to revise Luffy's bounty to 3.5 billion, as Luffy won't be beating Kaido alone. 3.5 billion is also 1.1b billion less than Kaido's 4.6 billion bounty. so yeah 3.5 billion sounds good for Luffy, lower than Kaido and also lower than Shanks.