There is debate about the origins of LGBTQ, especially since the Left argue that the whole idea of looking for causes presupposes that heterosexuality is the norm. So, given that, there is no reason why in the future, heterosexuality could be completely abandoned. Hey, did people back in the 1960s see where this was all going. And how about now, good men? What happens in the next 50 years?
https://www.dailymail.co.uk/news/article-9295063/Nearly-16-Americans-aged-18-23-identify-LGBTQ.html