Are you even in Germany, OP?
OFC it's not ideal when a minority of a large minority community reject the multiculturalism that allowed them to live where they do, but free speech means they can say what they like and that's a feature of our multicultural democracy. Not everything can be an upside.
Even if - big if - a caliphate eventually comes about in Western Europe, it won't be in our lifetime.
What does concern me more is growing antagonism in public life and between minority groups. I think we are on track for more marching, protesting and even rioting in our major cities. Again, though, this is probably a natural life stage of a multicultural society struggling to find equilibrium.
I'm too old for it all, though and I'm moving from city to country.