spiders are on the boat. hisoka is likely going to murder a great number of them. this boat trip is going end the story for a bunch of characters. the DC continent will probably only leave a couple of people alive at the end too.
The one out is that the option of escaping from the boat has been introduced. It seems pretty tough to accomplish, but I think there's a good chance some of the Phantoms bail out before the DC with some loot from Kakin. Once the boat hits the DC, however, I doubt many of the folks who head over will be making it back.
Also, I know Togashi is unpredictable, but is there any chance the succession battle doesn't end in one of two ways?
1. Tserriednich wins, (Woble might be the only other surviving prince if she escapes) and Kurapika must find a way to take him out on the DC. He could end up being very powerful with a strong nen ability + a terrifying nen beast, and seeing Pika take on a non-spider that strong would be interesting.
2. Woble wins by default as the other Princes take each other out and Kurapika takes down Tserriednich.
#2 almost seems more likely to me, as I don't think Kurapika will actually be part of the DC expedition once Tserriednich is taken care of. This seems like his arc while DC will be mainly Ging's. I could see him dealing with Tserriednich and then secretly returning to the mainland with Woble to avoid the wrath of Hui Guo Rou, who is now left without a successor.