Mark Steyn has written an excellent piece on his theory about the West being in danger of disappearing. Here's an excerpt:
Most people reading this have strong stomachs, so let me lay it out as baldly as I can: Much of what we loosely call the Western world will not survive this century, and much of it will effectively disappear within our lifetimes, including many if not most Western European countries.
It's long, but worth the read. Big nod to the excellent blog Irish Pennants for pointing this out.