I was thinking just that, but then I made sense of the bogus genetic and social assumptions that were being made, i.e. (1) that homosexuality is primarily genetic, (2) homosexuals are the only reservoir of homosexual genes (which is very unlikely if homosexuality is a polygenetic phenomenon or if it relies on gene-environment interactions) and (3) that homosexuals will no longer reproduce if they can have accepted, public, same-sex relationships.
In response:
(1) Twin studies seem to indicate that homosexuality is determined by both genes and environment.
(2) It follows from (1) that there will be people in the population who possess the 'homosexuality genotype' but do not express the phenotype as a result of their environmental circumstances. Furthermore, if homosexuality is polygenetic then much of the population will likely carry these genes to varying degrees (perhaps making them less likely, or unable, to express the phenotype if they only possess some of the relevant genes).
(3) The closed, monogomous male-female relationship is not the only available reproductive option, especially with fertility medicine on the scene.