I suspect humans have a built-in suicide switch. When life becomes too comfortable for groups of them, they stop reproducing, because they are too far out of the scope of nature that mostly dictates survival. Whites have been doomed by their own success, but if you track birth rates of immigrants to USA, you'll see they become less fertile in time too, suggesting that no race is immune to the "poison" of comfort. The West has become metaphoric birth control for human beings, which is why I don't have much confidence that it will be saved.
Roosh
http://www.rooshv.com