I don't know the stats off-hand but I imagine there's more MTF trans than FTM and I imagine the prevalence of gay is higher than lesbian.
By pushing the LGBTQ+, my hypothesis is that is removes more men seeking women from the dating market than it does women seeking men. Thus the supply of men is reduced and the demand for women is reduced as an overall impact of LGBTQ+.
Thus, were LGBTQ+ to not exist, would that make it even harder for straight men to compete for women?
Pareto principle applies when you have unshackled hypergamy. It's unnatural for all men to reproduce, that's a product of patriarchy and civilization. Natural is for the top 20% of men to reproduce and the rest of the lower men to work and fight to take care of the tribe. Genetic diversity testing support this, only 17% of men reproduced in history. We are simply going back to the way humans lived for thousands of years.
Isn't war a large part of this though? We don't have enough wars to kill off excess men.