At this point I think there's only 1 of 2 possibilities going forward with Bonney's character.
A: she joins as the final Strawhat
B: she becomes a major recurring ally like Law
As of the current chapter, Bonney and Kuma have appeared more this arc than Luffy has. The only non-Strawhats who got focus comparable to what they're getting were Law in Dressrosa and Vivi in Alabasta (and Vivi's an honorary crewmate anyway).
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I think the issue here is that Kuma's effectively dead. He's operating on pure primal instinct to protect Bonney fron Saturn. Kuma's whole character seems to be built around the idea of him being a martyr. He's going to perform one last sacrifice to protect Bonney. I know One Piece has an issue with fakeout deaths, but they've explicitly gone out of their way this arc to say "Kuma is dead and there is no bringing him back."
Also I
really don't think they'd be giving Kuma such a heartfelt sendoff if he was going to make it out of this arc alive.