The near one million refugees in Germany have no realistic chance of outnumbering a population of 80 million anytime soon. The only realistic problem with the refugees is them using up government services , but that's good because it'll end them faster through collapsing them, and they can get rid of the welfare system (which is funded off the mass extortion of property from non-violent folk).
The population of germany has remained pretty constant since 1960 (50 years ago) due to the aforementioned 1.3 birth rate. The rise is very slow, from 72 million 50 years ago, to 80 million today, and the population is expected to fall due the really, really low birth rate.
When you then consider that syrias population since 1960 has gone from 4 million up to 22 million today, it's not hard imagine that in a few decades, germans are a minority.
Edited 5/7/2016 16:21:39