I tend to agree with the doubters.
Have people fly aeroplanes??? Far too risky!!!
They might have heart attacks, forget things, misinterpret situations, make wrong decisions, decide to commit suicide, fail to communicate with each other, fail to understand or simply disregard procedures or regulations, be incapable of making best use of the resouces available, or simply fall out and refuse to cooperate with each other.
No, let's stick with automation. Its much more predictable.