The USA has had it good for a long time and has become very spoiled by it's priviledges.
Essentially, the US overplayed it's hand and there will be blow-back consequences.
I could imagine a terrorist living in Germany and the US asks for assistance obtaining him and the Germans tell the US to fuck off.
It doesn't even have to be a terrorist, it could be a person like Snowden. So, now, instead of assisting the US government, the Germans are actively working against them.
Or, I could see the Germans investing heavily in developing technologies that prevent spying. Germany could become a place where you learn how to NOT be spied on.
All this because the US Government doesn't know how to treat allies and respect sovereignty.