it's so fucking funny that the 1999 HxH anime ended on a cliffhanger, fans were disappointed with that ending, then it got picked up again as a limited OVA series, and then it ended on the scene of Gon and Killua using Accompany and landing.
on the flip side though..........honestly i think that would've been an interesting place for the entire story to just end, and the left is up to your imagination