I don't think it's inevitable. If anything, eugenics has been disproven on many levels as a viable model. You can't infer the future from just a set of genes and trying to simulate their expression as there's just too many unknowns in our environment which leave doubt to the probable outcomes of any organism, human or otherwise. The key issue with Eugenics is its belief in a clockwork view of genetics which today has been disproven in the last 30 years. Life ain't a clockwork, it's a chaotic system.