Alrighty. This crazy woman is the whole reason I made this theory. Boa Hancock is the most interesting character left in the Warlords in my mind, and not just because of her hilarious affection towards Luffy. Hancock is the only one who really has a sad, meaningful backstory (the whole saddening slave thing). I think this could be a set up for something huge, which I’ll explain, although I may sound nuts. Also, she’s the only one that really has a real bond with Luffy besides Kuma, but he is a little different in that respect.
The entirety of Amazon Lily is protected by the WG because of Hancock’s status as a Shichibukai, and is what keeps the island from, quite frankly, being Buster Called. IF/WHEN the Shichibukai system is abolished, Amazon Lily as a country is, by all means, f***ed. At least to me. The WG labels the whole country as pirates, no matter if they sail on Boa’s ship or not. So if Boa ends up not a Warlord anymore, either because of her relationship with Luffy or because of a future abolition of the Shichibukai system, I believe the entire population of Amazon Lily will be forced off the island by Boa’s word before the WG can wipe the island out.
Obviously they’ll need a bunch of ships, but that’s not a huge problem. The problem lies with the WG going after the Kuja pirates as a whole. Boa will be chased down, and I feel like even though he doesn’t feel the same for her, Luffy would do everything in his power to keep her safe, as he’s helped/saved him multiple times already, so it’d be his time to return the favor.
This being said, I believe if the entirety of the island sails together after having to leave AL, that they’d be strong enough to take on Marines on their own. AND, I also think that Boa’s sisters would be strong enough in their own right to lead and command the theoretical Kuja fleet on their own. I think Luffy would want to have Boa under his protection and (this is my biggest prediction for this writing) I truly believe, that whether he asks her, or she asks him,
BOA HANCOCK WILL JOIN THE STRAW HAT CREW.
I know this is completely out of left field, and I may sound COMPLETELY nuts, but I think that this crazy theory of mine has a chance to happen, but not for a while. The Straw Hat crew only has two females, and at this point, I don’t think there would be any other female characters that would be introduced (except Luffy’s unmentioned Mother, who will definitely not be even passed in conversation for a long while), that would have any reason to join the crew. (Save the Monet talk. I’m 99% sure she’s dead). I think a character like Vivi could “rejoin” at some point, but Boa is the only other female I could see joining the Straw Hats, and the circumstances I mentioned are the only way this could even remotely happen.