If the brain is a computer, then once there are sufficiently capable CPU's it'll be possible to build a human brain analog.
What if the brain's not a computer? That is, what if it's not just spooling through formal language instructions and doing simple arithmetic operations on binary data? What about all the information--billions of years of evolution from simple elemental matter to consciousness--that's stored within human beings?
My guess is the brain doesn't operate on formal language, so you can't build a brain with a computer no matter how fast the computer can operate on binary data. Similarly, you can't "read out" the billions of years of evolution history.
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