Britain, France and Germany can never replace the catastrophic loss of their best genetic stock from 1914-1945. Their culture is finished. A barren man like Macron with no genetic future is the appropriate leader for France. Trump if he does nothing else, should trust his instincts and get the US out of NATO and most foreign entanglements.
Is this actually true? Regardless of our gender, our genes come from both our parents. The British, French and German women who survived world wars I & II would pass the genes of their fathers onto any children birthed after WWI and/or WWII . Also regardless of gender: British, French and German children who survived WWI and/or WWII would pass the genes of their (dead or alive) fathers onto their children.
I don't claim to be a genetic expert but it may be that the gene pool is more secure and insulated from wars than we think.
All the leaders of Europe are childless.