I'll take a crack at it anyway since even though no one is saying it, it's right here in front of me staring me in the face.
Intelligence isn't the hardware, so obviously replicating neurons, even if 100% successful won't get us there.
Intelligence is essentially the software that runs on these neurons, and that can be replicated and adjusted to run on different kinds of hardware. That's where the next AI summer will come from. From the replication of a whole different layer of mind. The intentionally neglected layer with all those gooey non-binary emotions and impulses that the common engineer will never dare to approach. It is the environment in which Minskey's agents live and interact. The layer that we might come to know one day the mindOS.