I get it, this is why I haven't already had a vasectomy, but your genes are nothing special, just a sample of the alleles in the population.
I'm much more concerned about producing ideas that will outlive me and spreading those. Newton died a virgin yet he profoundly influenced the world.
Similar with cultures, ancient greeks are long gone but their culture shaped the world.
But the question here is: Will the value of "men and women should fulfill the same roles in society" survive or die out?
And no I don't think that this value is under threat from other cultures just because they reproduce more.
The value didn't get established in society because the people who held it reproduced more. Also, those who oppose it won't necessarily continue to reproduce more forever.
Atheists have smaller fertility rates than any religion, yet atheism is spreading more and more