I would be very disappointed if that were the case, since that would mean that Hancock has learned absolutely nothing from this whole ordeal, as there's been a clear greater good thread going on there, weighing the well-being of her entire nation against her own selfishness. I would hope, nay, expect, that her being impressed with his selflessness on Amazon Lily teaches her a little something as well.
Luffy's probably going to be all right. He's got titanium-grade plot armor as well as Jimbei looking after him.
As for symbolism in titles and all that, many of our former presidents, are, well, former presidents. Does that stop people from acknowledging their reputations and even admiring some of them?
Even knowing Luffy she hasn't changed her habbits at all, she is only different when around Luffy. She hasn't learned a thing. Now she might change down the line (in fact im betting some of her more 'bitchy' qualities will change before the end, at least when it comes to her being too selfish (this will not happen right away either but something progressive like Ussop and his cowardice/bravery) but her clinging to the title of shichibukai is not one of them. She was willing to sacrifice her island so she didn't have to go to Mariejoa and the only reason she is still there is because it would otherwise compromise Luffy AND her safty at the same time. The minute she is in the clear she will betray the marines, and if she doesn't there will be something personal holding her back and not her island. She was not setup to learn anything in regards to her selfishness, she was setup to learn how to accept her past and trust that others will to. She has a persona she is clinging to out of neccesity because she doesn't want to lose the power and loyalty she has garnered through dominance.
And I agree with what others are saying, shichibukai are merely dominant focal points of pirates only because they were with the government and nothing more. They are basically silvermedalists in the grand scheme of the story that chose a different path because they either wanted protection or a means to continue their dreams with fewer struggles. They may have 'seemed' bigger when the story first started but at the halfway point Luffy himself is showing he is more than capable of standing amongst them, and after the marineford/impel down incident becomes public he will become more notorious than the shichibukai's themselves, so there is absolutely nothing holding a shichibukai from joining under him. They are not 'presidents' in any sense of this story, they are pirates garnered by the government that have gained a reputation just because they are public figures and maybe whatever they might have done in the past (which even to today we don't know anything about how some of them got their bounties). You are clinging to info we gained in the past, and since than their reputation has diminished in the grand scheme of the story but you won't accept that.