A popular theory nowadays is that the human race will gradually be overtaken by a race of robotically-engineered humans, or cyborgs. According to proponents of this idea, the starting gun in our race to extinction will be the limited availability of performance enhancing technologies for humans. For instance, in the future, it is believed that we will have medicines and procedures that can help solve issues that are currently unsolvable in our modern day. Things like cancer will be as treatable as the symptoms of the common cold, and amputated limbs can be replaced by functional, prosthetic ones that allow people to normally go about their lives. People even go as far to suggest that technology developed to a point where the human mind can be downloaded to an implanted microchip of sorts in the brain, transmitting neurological information to a supercomputer that catalogs everything from it: our thoughts. Our dreams, our personalities, etc. would be stored somewhere for safekeeping. These miracle technologies, however, will come at a high price, affordable only to a small elite. At this point, the idea proposes that this small aristocracy would genetically modify itself to become overwhelmingly superior to the impoverished majority and begin their own race of cyborgs, leaving the real humans to a fate of either enslavement or genocide.
This theory is half-truth, half-fear. Do I doubt that the human mind is capable of producing such technologies? No. The human race is, without comparison, the most dominant species to ever walk the Earth. What we lack in strength to certain animals, we compensate for in an unmatched intelligence, and that intelligence, which has only been slightly tapped into at this stage in our history, is what propels our evolution. It is feasible to suggest that technologies similar to what I described are on the far horizon for the human race. However, some of them sound more like works of sci-fi then reason. Prosthetic limbs that function with the human body? Reasonable. A way of producing non-cancerous cells to overtake the cancerous ones? Probable. However, something like the brain microchip, for instance, doesn't make any sense to me. The human mind is an enigma that even the most respected cognitive scientists in the world have the most minimal grasp on. If we are unable to understand our own minds, do people really think that we would be able to develop a technology that could create an artificial copy of it?
I also have a huge problem with the speculation as to what would happen if these technologies were made available. The predicted results of this new technology are entirely rooted in fear. It's not unreasonable to say that the exclusivity of this technology to the affluent will widen the gap between the rich and the poor. However, it is totally unreasonable to say that the rich will all of a sudden kill and enslave the poor because they are now even more superior. It's entirely irrational and sensationalist. If I wanted to hear that, I wouldn't read an article or an essay written by some scholar; I'd just head over to Comic Con. Sure, societal ethics change over time, but genocide, especially in this hypothetical situation in which it would be happening to the majority of humans, has always been frowned upon. There isn't going to be some cyborg race that detaches itself from its human emotions and coldly murders its creators. Once again, new ideas always breed fear and exaggeration.
The idea that genetic engineering will dissolve our humanity actually defeats itself. Every species has its own skills that it uses to survive. Chameleons blend in with their surroundings to hide from predators, and opossums play dead to trick them into leaving to find new prey. Humans are different in the sense that they don't live to survive but to sustain themselves, but like the abilities of camouflage and playing dead, methods of extending life, humans use genetic engineering in order to better their health. So even though they may alter their natural state in order to fix an illness or imperfection, engineering itself is actually a very natural part of humanity.
In the end, people will play into the hand of fear and resist the idea of robotics becoming an accepted one, but as with all helpful ideas, the resistance will eventually subside once people see the benefits in action. The feared race of cyborgs will not look like this:
But rather like this:
Hopefully one day, we'll actually have prosthetic robot arms and lightsabers like Luke, and maybe even superhuman strength and arm cannons like Cyborg, but I digress.
When it comes down to it, the development of genetic engineering will not bring about the end of the human race but rather the end of the chapter of this part of the human race, one still plagued by medical issues that are currently unsolvable. The next chapter of human life is unpredictable in all areas but one, and in that one area - health - I know our race will be even better off than before.