In the New York Times Magazine, Niall Ferguson discusses the growth of Islam in Europe. How it will end up, he does not try to forecast, but he does consider scenarios.

What the consequences of these changes will be is very difficult to say. A creeping Islamicization of a decadent Christendom is one conceivable result: while the old Europeans get even older and their religious faith weaker, the Muslim colonies within their cities get larger and more overt in their religious observance. A backlash against immigration by the economically Neanderthal right is another: aging electorates turn to demagogues who offer sealed borders without explaining who exactly is going to pay for the pensions and health care. Nor can we rule out the possibility of a happy fusion between rapidly secularized second-generation Muslims and their post-Christian neighbors. Indeed, we may conceivably end up with all three: Situation 1 in France, Situation 2 in Austria and Situation 3 in Britain.