Germany is in big trouble because its fostered a culture where its not considered cool or hip to have children. Women now want to stay in college for their entire 20's. Enter the work force in their 30's, and not be burdened with with children while trying to move up the ladder.
Germany's birthrate amongst ethnic germans is now almost non-existant or having one child is considered a massive stretch.
Let's not forget the vacations. What childless German couples don't spend on cars or big houses, they spend on vacations in Malta or the Canaries.