This is the problem Japan experienced starting decades earlier than us. (We also have more immigration which puts us in better shape than Europe and esp Japan which accepts very few immigrants.)

Also - you're here on DU. You just said you have some but few offspring. So that means few progressive kids. The religious families are still having big families. A USA filled with religious crazies and few progressivea will do far worse damage to the world than if you add a lot of smart active progressives to the mix.