

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.


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sword-art-online
Why don't they just upload her brain to the internet?


They don't do it because of the fail rate. The scan according to the light
novels has an extremely small rate of success, and the scan almost certainly
fries the brain.

Quoted from _Sword Art Online Volume 4 - Fairy Dance, Chapter 9_ (translation
courtesy of Baka-Tsuki):

> It seemed Kayaba had decided to die with the collapse of the world of SAO
> before the incident even occurred. But it was an unusual way to die. It
> seems he remodeled a FullDive machine to perform a super-high-power scan of
> his brain, where it burned out his brain and killed him.
>
> The probability of the scan being successful wasn’t even 1 in 1000 \- and,
> although it was baseless, she told me that in her heart she had the feeling
> that he somehow had succeeded.
>
> If it worked as Kayaba intended, his own memories and thoughts, all of the
> electrical signals in his brain should have became digital code and should
> exist in the network as a real electronic brain.

It is safe to assume that it's for the above reason they don't do it.


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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.


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