A hopelessly hypothetical philosophical conversation based on an impossible premise or thought experiment, that a living human brain could somehow have its billions of neurons and trillions of synaptic juctions, along with all the numberless interactions of chemo-electric potentials and other micro-processes associated with them, progressively replaced by microscopic mechano-electronic nanobots, while all the time remaining alive and functional.
Both protagonists reject dualism and the transmission (or rather transceiver) theory of mind, so the outcome was inevitable. Of course the subject would experience an imperceptible transition to machine consciousness, by the same token that there is an imperceptible transition of consciousness during life due to the successive replacement of living cells. Sure.
Far more likely (but still infinitesimally so) is the progressive destructive scanning of the brain down to the molecular level, with the microstructure revealed being converted into a vast digital data file.Then the (even more insurmountable) task of implementing a brain functional simulation processing that data file. This would also require simulation of the whole body/brain interface and the body interface with the outer world, or somehow interfacing with the original body kept alive throughout the process. Preposterous, but even if this were somehow possible it would be a poor decision for the subject, since it would inevitably result in death for the original person. Why would he care if a duplicate "clone" or multiple "clones" somehow resulted? He is still annihilated. In any case I think the magnitude of these tasks is so far beyond any forseeable techno capabilities that we can write such ideas off as pure fantasy.