Indeed. And there seems, to me, to be something nihilistic in the idea that Europeans should simply let immigrants replace them. Maybe instead, European nations should look into instituting domestic policies that encourage the population to maintain a healthy replacement rate.
The article appears to be implying that Western nations should not make war against Daesh because "that's what they want." Well, the status quo of surveillance, arrests, and half-hearted airstrikes isn't stopping them. There seems something profoundly suciidally nihilistic in the idea that Europe should simply do nothing different and simply be more and more welcoming as attacks happen in an attempt to appease extremists until at last Europe is no longer populated by Europeans.
On the timescale of centuries and millenia, it's amazing how little has changed in the past thousand years. This could be just another couple chapters in Decline and Fall of the Roman Empire. (Which, for those who don't know, covers mostly in later chapters the European nations and the various Muslim empires.)