I think Togashi said that he writes his Story based on how he thinks his Characters act
In other words, he doesn't just decide someone should die or not, he just asks what would those Characters do now?
And then write his Conclusions
That's why i believe Franklin could be going down next seeing how he is the only one who chose to sit alone.
Shizuku & Bonolenov are safe for now since they decided to tag with Chrollo & Hisoka said that Chrollo is Last
But at same time i don't think he would decide to attack Trio of Nobunaga, Feitan & Phinks at same time, it's too dangerous
As for Illumi & Kalluto, i think Hisoka want them to chase him instead & not attack them himself first
So here is what i think will happen (Assuming that most of them gonna die indeed & Kurapika/Hisoka succeed)
Franklin will die first by Hisoka & the reports of his Death are what will inform Kurapika of Troupe's presence on the Ship
So Kurapika will start his search too & he will find Machi who is also alone, once he engages her, Nobunaga, Feitan, Phinks will attack him & reveal that after Franklin died they decided to follow Machi secretly thinking she will be the next Target
Once Kurapika gets overwhelmed, Hisoka will appear & assist him, i expect one of those four to die & that is Phinks imo
Fetain will be very injured so he will activate his Ability & cause everyone to run & get separated interrupting the fight basically
Hisoka will then make an Alliance with Kurapika after they are alone & make a Plan.
I expect Togashi to hold off Chrollo so he is left last, that's why i think other Characters will face him & delay his Chase of Hisoka
For some reason i think Bonolenov will be killed by someone other than Hisoka & Kurapika
So for now i believe the first three Members to die are:
1. Franklin by Hisoka
2. Phinks by Kurapika
3. Bonolenov by someone else
Remaining Members need more thinking xD