For those who have, a couple of questions.
Oh boy, big topic!
First, this has been touted by some a way of surviving death (and so far is presented that way in the series). But if these people think the consciousness of the biological person transfers to the machine, what do they think happens if the data is uploaded into two machines at once? Will the consciousness be aware of being in two places at the same time?
I guess it really depends what you think where or what consciousness is.
If you are a materialist you probably think that consciousness is an emergent property of the physical brain (and the interaction with the physical world, but let's leave that for the moment.) So, a bit like the teleportation issue, if you 'transfer' the various mind states from one body to a new one, I do think that really it is the end of one entity and the creation of a new one. That's not immortality in my book, even if the new one has all the experience and memories of the old one it is
not the same consciousness. I guess one could argue that the 'pattern' that represents a mind has survived, so that could be an immortality of sorts.
In this case, having two bodies constructed for transfer wouldn't really be a problem. There would just be two copies of the consciousness, that would then go off and diverge from each other I presume.
On the other hand if you are dualist and believe that the mind is separate from the body then perhaps you could imagine the 'soul' floating over from the old body and attaching itself to the new body...but I do think you have an issue here. Namely why is your mind connected to your body in the first place? What happens when you bin the old body? Does the soul flit off somewhere else? Why would it reconnect with something else? You'd have to answer these questions before moving on to: what would happen if there are two identical bodies?
I think a better way of (perhaps) attaining immortality, that does not involve transfer, would be to take a 'ship of Theseus' approach - if you are a materialist I guess.
So, say you have an advanced nanotechnology that can replace a neuron with an 'e-neuron'. An e-neuron is identical in function to a natural neuron, but, let's say for this thought experiment cannot die and is effectively immortal. It can also be seamlessly be injected into a person's brain and replace its target neuron with no harm. Thus as someone's consciousness is still 'running' the substrate that produces the mind is slowly converted into immortal parts. Then I'd suggest that could provide a person's consciousness with a form of immortality.
Of course could we really produce an 'e-neuron' that 100% accurately replicates the behaviour of your original neurons? Cells are tremendously complex things.
Second, if a machine intelligence claims to be conscious, how will anyone know whether it is merely hallucinating in the same way that ChatGPT etc does?
Quick answer, I'd argue you have no idea if anything else in the universe, except yourself, is truly conscious. Being a subjective being. I'm afraid, is problematic in this regard.
If I am being very nice to ChatGPT, I'd say that it's programming uses mechanisms (neural nets) that we believe our brains use in order for it to work. So one could argue it's related to our brains in some manner. But generally, right now, I don't even think it's hallucinating that it's conscious. It's just not conscious. We're just a bit excited that the process that gives us a ChatGPT output gives us the impression of intelligence. (We can be easily over-excited...)