Either I misunderstand or others do but never said Panam the cure would be in Arizona. And even if she doesn't really know what V went through her "message" was kinda like this (hope for clarification or correction if it's wrong):
Don't worry, we will find a cure. We know lots of people in Arizona who might be able to help you. They were able to solve issues far worse than your problem. It will be alright.
-Not original but the essence of the message should go like that.
TL;DR
Panam didn't say there is a cure, but she knows people who might know people and solutions to the problem. Kinda like that.
And that is fine. But that works if you choose to with with them and they leave NC. One of six endings.
Other endings imply they are still at NC.
An expansion that focuses on curing a dying V in Arizona would be a darn difficult decision as so many players could not import their V's to the expansion.
As if somehow a dead V in cyberspace makes it back into a body its either:
Arasaka putting her in one
ALT/some AI (merged delamian anyone) getting her back somehow - BUT
the act of getting back into a body would nullify the needing to go to Arizona for a cure.
The fact that the endings are so vastly different would make any expansion very very costly in time for animating and VO work just to incorporate the separate endings.
That and getting over the cognitive dissonance of finding someone who could do it - where arasaka failed and ALT failed
These are some serious hurdles to jump.
Thats not taking into consideration V attacking space station, etc.
and if in NC - is Rogue dead or alive. Can't be both.
Is Rogue or V head of Afterlife.
CEO of Arasaka
Corp War on or off
The sheer number of binary choices involved is staggering. Dying V in her body vs, dead V her engram in cyberspace or even in mikoshi