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It's only starting to become clear to me what a widespread belief this is, and how detailed its fantasy world has become.
As noted in the accounts of the NRO cruise, they have already written off Europe. The faux-scholarly air these guys take on would be laughable if it were not so pernicious:
I’m not sure whether most of Europe, even all of Western Europe, will fall to Islam in the end. Worst case scenario: Muslims will create several smaller Pakistans or Kosovos, for instance one stretching from parts of France via Belgium to the Netherlands, one in regions of England and another one in southern Sweden.
http://gatesofvienna.blogspot.com/2007/08/west-in-21st-century-developed-or.html
Other times it's just laughable:
People like me, of European ethnicity, will have no home, no nation. We will live like the Jews as elites in other people’s nations (preferably a non-Muslim nation).
http://conswede.blogspot.com/2007/08/im-island.html
Of course, it's easy (and fun!) to laugh at other people's blogs, but as you correctly note, this is not a fringe belief any more, if indeed it ever was. It's really not clear in which direction the contagion has spread, from the blogs to the pundits or vice versa. But these people are so invested in the Terror War that they have become the Terrorized, almost as if they needed to have the Terrorists be their constant foils.