Hm, I think thereīs one solution to this whole arcīs problem: Komugi will bring the king to the "good" side. The king infuses his nen into Gonīs body, basically recharging Gonīs life power. At the same time, the king becomes weaker, thus stopping to be a dormant danger for mankind. The end.

Other than that, hm ...
I mean, something thatīd be certainly interesting would be a Gon without nen powers. Imaging Naruto without chakra, or SonGoku without Ki, or Ruffy without his gumgum-powers. Itīd be game changer. Hereīs the question: Is Nen all there is to "our" existence? What I mean is that Gon could strive to search for alternate power sources. Not necessarily sciene based powers, but simply something akin to Nen, but stemming from a different path of learning. Ever since nen was introduced to this series, we took it for granted that this is HXHīs version of chakra/ki/whatever.
Itīd be a fresh take on an old concept, if a shounen series actually featured more than just one source of power. Although itīs questionable how believably this new power source could be introduced. After all, wouldnīt all these nen masters like Netero, the Zoldyeks or the Spiders have heard of them already? And weīve never heard a single hint at something like it.

Nah, no idea how Gon can survive, get back to normal and keep using nen.