In what way? If you get to control the human breeding process and have enough quantitative criteria in order to be able to make the most efficient choices, you will be successful.
It sounds so reasonable and intuitive to the untrained mind: First you need to understand all the parts and then you can just manipulate anything to do whatever you want it to do.
Yet... we completely fail at micromanaging much less complex systems. Once a system reaches a certain level of complexity all top-down planning simply falls apart.
If you read some general systems theory and advanced organization & management theories based uppon the former you will quickly learn just how limited top-down planning really is.
Furthermore... the most spectacular screwups always tend to involve people who intuitively assume that their top-down planning just has the work because they are so sure that they didn t miss a variable.
Well guess what.... missing a single variable could not only spell the end of the human race if you are tinkering with the genome, history (and related statistics) tells us very conclusively that the moment you implement top-down planning it's pretty much a given that you miss the more variables the more complex the system you attempt to manipulate gets... and consequently the actual outcome differs more and more greatly from the intended one.
Bottomline: We re are much more likely to conolize the whole solar system before we understand the human genome well enough to manipulate it completely "safely" - if its even ever possible at all. Note the word: "safely". It's the keyword.
Heck, we can't even model weather or the economy all that well yet and you want to start manipulating isolated variables in a system as complex as the human body which by itself is only part of the larger system of the human race.
It's about as deluded as watching an episode of Star Trek just to state that you don't understand why we didn't build FTL Starships yet as that would clearly make sense.

I.e.: You have an idea and a goal and maybe even good intention... but the more relevant fact is: you have not even a hint of understanding of how the whole thing actually works.
To get a deeper understanding of just idiotic the manipulation of complex systems that you can't even properly describe yet actually is, I would wholeheartly recommend Niklas Luhmann's criticism of prescriptive theories in social or economic systems.