Assuming humanity is not destroyed by its own poor decisions nor by a cosmic event, the human species will flourish, become far more varied, and eventually speciate into unrecognisable multifarious forms most beautiful and wonderful, to borrow from Darwin. This process would occur naturally, but humanity's knowledge about its own genetic makeup will greatly accelerate the process. What starts with "Designer Babies" now to eliminate disease from the population, will certainly expand into mere cosmetic engineering, life extension, and superhuman abilities. When in vitro fertilisation was developed, many ignorant reactionaries even questioned if the children born of this would have a soul (while of course assuming that the rest of us do). Now that your best friend could be a test tube baby, the mob has for the most part come to terms with in vitro fertilisation and often see it as a necessity and a right for couples with fertility difficulties. Being a proponent of adoption, I discourage test tube babies for environmental and social reasons. Nonetheless, I do not have an inherent problem with the technology. Similarly, genetically engineered people are as inevitable as genetically engineered crops. You may wish to stay organic, but that will not stop anyone else from moving forward towards greater health, prosperity, and complexity. I instead would call for further research and development and government sponsorship of this technology and its implementation. After all, it is in society's best interests.
The position of the Roman Catholic Church in this matter prompted these thoughts.