The fact that we will be able to eventually control our species and how it evolves will is awesome. However, it will be very problematic for our entitlement based economic system. We already have a problem with people retiring too early, and with the new technology coming out human life expectancy will increase dramatically. We are on the verge of coming to the point where technology will surpass humans, and when we get to that line we will have two choices. One we can not cross it and never have to worry about it, or what will probably happen is that we will cross it with vigor. For the biggest threat to humanity is not disease, or natural disaster, our biggest threat to our species is our endless pursuit of knowledge.