Possible, sure.
But you always have to remember one thing: It's still Oda (who loves to drag stuff out), there are in fact some plot-lines open (her Elbaf connection, her good O-Lin side, Luffy declaring that HE will beat all emperors etc.) and the editors are simply full of crap.
I would really say chances are 50:50, but only because she's an important player and bc of all the buildup. Would be definitely out with this chapter if not for all those points.
I would hope so but i actually believe she's no done yet.
There's been seeds planted in previous chapters that lead me to believe she'll betray Kaido and aim to take the road poneglyph for herself.
I could see her being unconscious for a while in the basement though.
Totally forgot about this one.
The more I think about it, the more I hope she isn't out yet (only for storytelling purposes). There are just so many loose ends that Oda has to cover with her.
If she's now out for good, Oda teased a shitton of stuff just to never pick up on it again ... that's not exactly great writing.