I agree with your statements about what would happen if the mind were duplicated artificially entirely. I'm surprised, actually, to encounter somebody else at last with such a realistic and dismal view of human nature.
We're not special. However, I doubt, without near complete functional understanding of the human mind, we will ever be able to duplicate it in full. The naive neural complexity argument has never been reasonable either, a system is not merely the power it can bring to bear. Even if the connections could be modeled, they would then need to be tasked and used. The mind has an inherently different structure from any computing system we have devised, and none of the proponents of equivalent artificial sentience and electronic human modeling seem to take this into account.
It may be possible, but it seems unlikely that humans have the capability, and since we're the only beings capable of complex construction/intellectual synthesis in our own perception of the universe...
Of course, I'm sure this will never be accepted by the transhumanists who delusionally presume themselves capable of transcendence and perceive consciousness as a boundless construct. You know, the other group of people who think we are special.