There is no longer a system of natural selection in-built into our society anymore, where certain undesired traits would lead to individuals dying off or not procreating at all (Born with any form of disability? You'd die in nature for it, no breeding for you). Also a lot of people apparently have a very wrong view of evolution, it's not a magical "Next generation you get wings/gills/etc." it's a fairly slow process of several mutations occurring (less often in large and varied populations of a species, more often in small and inbreeding populations) over large periods of time, only some of which are actually beneficial (those born with non-beneficial mutations or those "left behind" without the beneficial ones will feature dwindling numbers, die or simply not be chosen to breed); It's fairly more complex then this, but what people need to take into account is Lamarckism is incorrect, you don't gain "new features" over 1 generation because you "need" it, it works with mutations and natural selection.
As for an answer to the OP's question, due to the large and dominant human population not suffering a considerable reduction (though scarce resources might reverse this trend), humans will perpetuate in certain local societies whichever traits are considered "more attractive/useful" (depending if the society is developed enough not to care for practical traits or not) via breeding, ex.: If a huge fad for "darker skin = better sex" rises in a certain developed nation and perpetuates over a few generations, there should be a CONSIDERABLE increase in individuals with that trait, and the numbers of whichever trait is considered unattractive will dwindle.
PS: However, if you do unlock the full human genetic code, all possible mutations and some theories on Stem cells turn out to be true... we could, in theory, hand pick which traits our offspring would inherit from either parent, or even access gene banks and artificial combine the sperm/egg of someone "genetically preferable" to one's partner and craft a combination leading to children born without disease or debilitating features... this is, however, a long-shot.
PPS: Currently, in most of human societies, some of the preferred traits are Tall Males, Light Colored Eyes, Blonde Hair, Little Body Hair, Slender Build & (to a lesser extent) Resistance to Illness (both infectious and hereditary), if these trends keep up this is where we should see a greater number of males and females preferring partners that contain as many of these features as possible, although there are always exceptions to the general rule that will prefer alternate traits.
As for an answer to the OP's question, due to the large and dominant human population not suffering a considerable reduction (though scarce resources might reverse this trend), humans will perpetuate in certain local societies whichever traits are considered "more attractive/useful" (depending if the society is developed enough not to care for practical traits or not) via breeding, ex.: If a huge fad for "darker skin = better sex" rises in a certain developed nation and perpetuates over a few generations, there should be a CONSIDERABLE increase in individuals with that trait, and the numbers of whichever trait is considered unattractive will dwindle.
PS: However, if you do unlock the full human genetic code, all possible mutations and some theories on Stem cells turn out to be true... we could, in theory, hand pick which traits our offspring would inherit from either parent, or even access gene banks and artificial combine the sperm/egg of someone "genetically preferable" to one's partner and craft a combination leading to children born without disease or debilitating features... this is, however, a long-shot.
PPS: Currently, in most of human societies, some of the preferred traits are Tall Males, Light Colored Eyes, Blonde Hair, Little Body Hair, Slender Build & (to a lesser extent) Resistance to Illness (both infectious and hereditary), if these trends keep up this is where we should see a greater number of males and females preferring partners that contain as many of these features as possible, although there are always exceptions to the general rule that will prefer alternate traits.
