Don't generalize to soon for Europe. Not all countries are doomed yet. Look at France demography: we are doing quite good.
I have a suggestion: every one knows German is an harsh language, better suited for warfare than for love. So I suggest German be banned in Europe.
We should make French, a language particularily suited for romance and love, the official language of Europe.
It would help the seduction process, and will increase the building of new love relationships, and it will lead to more baby.
Frankly, as a woman, wouldn't you be more likely to have a baby with a man who speak about Romance in French, or with a man who speaks this horrible German language?
It's also possible some German couples are deterred to have children, because thinking about the horrific process of teaching them German grammar and declination is so dreadful they prefer to avoid children completly.