Just because the West is about to go down doesn't mean a greater civilization is to take it's place. After Rome fell the world regressed. It was in this power vacuum that Mohammed saw his chance. But still, compared to Rome, the Islamic empire, though vast ,was second rate. We are approaching a new Dark Ages. So it goes. I wonder what date future historians will pick as the "Fall of the Western World"?
That would be sometime in 1949 when, after abdicating responsibility for their parents' well-being to FDR and the social security scam, the greatest generation abdicated responsibility for their children to TV.
Oswald Spengler - Decline of the West
What do you mean by Dark Age?
"When America ceases to be good, it will cease to be great."
Relax a bit. America isn't going anywhere but up.