Your selective usage of statistics is not going to help.
First of all, it is not 10 million on top of 500 million. It is going to be 10 million on top of 80 million, because the immigrants are interested only in Germany. They don't want to immigrate to the shit-hole nations such as Romania and Bulgaria. Now you may be thinking that the ratio will be 1:8. No. It is not.
Here are the reasons:
More than 70% to 75% of the immigrants are adult males, in the 18-34 age group. That means 7 million immigrants from this age group versus a population of 8 million native male Germans from the same age group. Now we are having 15 million males in the 18-34 yr age group, versus 8 million females in the same age group. Don't you think that this gender imbalance will be having serious issues?
Weird, when you have to repeatedly state the fucking obvious.