Exception....don't some of the northern countries still have a strong neo-Nazi underground? Could there be situations the over-confident governments of Germany and Austria cannot control? What about weapons getting to the underground via the arming of Kiev's maniacs?
Best thing that could happen is the EU breaks up over this and Germany and Austria are stuck with the migrants.
The push back will be terrible one day and I see another day where American troops will have to cross the Atlantic to save Europe again.