There's been a fear that if a genetic component to homosexuality were discovered people would abort "gay" fetuses. In some insanely PC places it's even against the law to abort them (before any certainty can be found) but nobody else.
But there's another possibility. There does seem a genetic component, especially since the condition crops up in all historical periods in all cultures -- suggesting it's no simply an environmental product. Also, even though it tends to work against reproduction and in some societies can cause the gay person to be killed outright, it still exists. The probability, it seems to me, is that it's an aspect of some useful property.
Suppose a gene was in fact found and simply removed from sperm or egg cells or from the fertilized cells that were then re-implanted. Then suppose the persons so "treated" -- say several millions over a few years -- turned out to be lacking in some quality: no ability to express emotion, no understanding of are or no ability at all to understand symbol use despite normal intelligence, or no sense of time, and so on.
Then what....? What will people do...but accept the occurance of gayness in order to be completely human. Or will there be more intense research on eliminating it?