That would in no way replace most humans. That's not how visas work in virtually every country. Humans are there not just to verify identity but to verify that

That would in no way replace most humans. That's not how visas work in virtually every country. Humans are there not just to verify identity but to verify that a person should enter. For example, if they sound like they may work on a visitor visa, or may overstay their visa, they may not be granted entry. Furthermore, for verifying entry, I fail to see how face detection biometric devices could ensure that the person walking through is the one being photographed, unless there are other humans in place or far more intelligent systems. Someone could hold up a sufficiently well-crafted picture, bring someone else to be photographed instead of them, etc.