While human brain emulation is not anywhere close one should stop and look at the sci-fi world we actually live in. It's important to do this in a non-anecdotal manner. When you look at the limits and capabilities of our current sciences and engineering we live in a science fiction world. Once you go back before the invention of electricity, anyone from that time simply would not recognize the world we live in, it would be a fictional world to them, hell, a fantasy world in a lot of cases. For goodness sake, we tickle things like atoms for fun and games then blow them to bits a few times looking at the fundamentals of reality.

Anyway, I see zero reason why we have to emulate a human brain to get human intelligence, much less intelligence at all. That is how nature did it via random probing and breeding meat. It would seem a bit crazy to think that the meat part is required.