This scenario is quite possible but not at this juncture when the US needs Pakistan in its WOT. Once the Americans leave Afghanistan, they would drop Pakistan as an ally like a rotten sack of potatoes. And then will start the countdown for disarming Pakistan by diplomatic, political, economic and other means, but not by military force.
They have their eye on Balochistan too due to its geostrategic location. Expect the fuse to be lit after 2014 by the CIA, America's dirty tricks department.
Balochistan has the largest oil reserve on the planet according to Carnegic Foundation.4 trillion barrels of oil proven. But the govt does not allow its extraction.That itself proves that there are outside forces controlling pakistan which want pakistan to be weak and controlled,particularly I suspect Saudi Arabia and USA.