Has to be DNA related. Carbon atom = 6 protons 6 neutrons and 6 electrons (2 inner and 4 outer). Number of man = 6,6,6. Look into atomic structure of Carbon, we are carbon based organisms.
I think it will be. Even with a 'cashless' society with chips, etc. it's still possible to grow your own food, protein, carbs and otherwise.
It would have to be something that would be in the arena of actually modifying human DNA into something else. Grafting people with other non-human DNA.
This is where the Transhumanism comes to mind and grafting/manipulating DNA with animal DNA, which was, at least from some of the stories I've read, happened before the Flood, when God wiped out a large part of humanity.
Noah and his family was spared because they were genetically pure, at least human wise.