"Leaders of the British group LGB Alliance warn that lesbians are 'going to become extinct’ as individuals increasingly identify as trans..."

"... a fear echoed both by trans-exclusionary groups and by lesbian feminists who in other ways advocate for trans rights. Feminist writer Aimee Anderson frets about 'the extinction of an entire people,' and Cherríe Moraga worries that butch lesbians, self-actualizing as transmasculine, might 'become a dying breed.' Tomboys, too, have become a point of contention, seen by some as a 'rarer and rarer species' that is 'going extinct' as more tomboyish children identify as trans and/or nonbinary.... As a lesbian researcher of tomboyism trained in queer theory, I find claims like these at once absurd and frightening. Extinction anxieties have long fueled nationalist, fascist and white-supremacist movements and often beget eugenicist agendas. Indeed, tomboyism as we know it arose in concert with eugenics.... Child-rearing manuals began advocating for exercise and comfortable clothing, instead of the restrictive and harmful corsets then common, as means of making White girls fit to produce healthy White offspring.... Lesbians are not a species, and we feed existing racist, ableist and homophobic agendas when we invoke extinction...." 

From "The latest form of transphobia: Saying lesbians are going extinct" by Lynne Stahl (WaPO).