It’s a good question. There’s some evidence that people are drawn into a homosexual culture because of propinquity (British public schools, for example) or because of other interests, rather than because of an overwhelming urge for buggery.
I think it’s likely that the percentage of people who engage in homosexual acts is increasing and will continue to increase in our present culture, regardless of how many “self-identify” as “gay.” To believe that there’s a fixed limit on the percentage of homosexuals in a population is (1) practically to accept the “gay gene” theory and (2) to adopt of definition of “homosexual” other than “engages in sex acts with people of the same sex.”
It’s interesting to question the definition of homosexuality. Until recently, it meant people who engage in homosexual acts - not people who had fantasies or urges in that direction. And, let’s face it, many licentious people engage in these acts while being heterosexual.
Amusingly, I’ve been reading Freud’s book on sexual deviancy and he mentions homosexuals who were “turned” in prison. Just as Ben Carson said. Carson was accused of being stupid and the good doctor was probably reading the very serious tomes of Freud, lol!