How about the various welfare states around the world finally starting to run out of other people's money. The biggest manifestations of this so far have been the financial crisis in the EU, and the various pension crises in US local governments.

Heck, in my more conspiratorial moods I'm inclined to suspect that these migrant crises are an excuse to import a bunch of convenient scapegoats who can than be blamed for the collapse of popular entitlement programs.