The WaPo interviewed David Kilcullen over the weekend. He was characteristically blunt:
Pakistan is 173 million people, 100 nuclear weapons, an army bigger than the U.S. Army, and al-Qaeda headquarters sitting right there in the two-thirds of the country that the government doesn't control. The Pakistani military and police and intelligence service don't follow the civilian government; they are essentially a rogue state within a state. We're now reaching the point where within one to six months we could see the collapse of the Pakistani state, also because of the global financial crisis, which just exacerbates all these problems. . . . The collapse of Pakistan, al-Qaeda acquiring nuclear weapons, an extremist takeover -- that would dwarf everything we've seen in the war on terror today.
The whole interview is worth reading.
(hat tip: Exum)