Why don't they just upload her brain to the internet?


So, in episode 22 of Sword Art Online II...

> We learn that Konno Yuuki has incurable super-AIDS, and that she's terminal.
> That's no fun.

But we know that there's technology out there that can digitize your brain -
that's exactly what Kayaba Akihiko did, and nowadays he goes around haunting
VRMMOs (or something).

Why can't they do the same for her and other people faced with the same issue?
It's not a great solution, granted, but she's already used to spending oodles
of time in full-dive, and I imagine it's preferable to death.




That answer will contain spoilers from Alicization arc, which has not been
animated yet.

> Firstly, what Kayaba Akihiko uploaded onto [**The
> Seed**](http://swordartonline.wikia.com/wiki/World_Seed) wasn't his brain,
> not exactly — it was a copy of his "soul". As explained in the light novel:
> We have copied the
> [_Fluctlight_](http://swordartonline.wikia.com/wiki/Fluctlight) of a number
> of test subject, and the Fluctlight is what passes through our neurons, so
> it's basically our soul. However, even though the process of copying
> somebody's soul is not risky for the real person, it is the case for the
> copies, because they will just "think" they were the real one and not just a
> copy. Most of the copies will simply cease to exist as they realize they
> aren't the original. Kayaba Akihiko's case was an exception, because his
> real self had already prepared to leave the real world to live in his own
> creation. So that's the major problem. Once Konno Yuuki realizes that she
> isn't real but just a copy, she would cease to exist.  
>  
>  The second problem is that the machine to perform the operation isn't
> public nor medical, and no one (except Kirito and a few others) knows of its
> existence, let alone where and how to do it.

In the Alicization arc of the light novels (especially the first two volumes
of the arc), the details are much better explained than what I have here (they
actually exaggerate with the explanation of pseudo-science, but well...), so I
would recommend you to pick them up if you are into reading, as the
Alicization arc is the best up to now in my opinion.

