Pakistan is in a catch 22 situation. Currently the might of the west is in Afghanistan trying to quell the Taliban and bring order and democracy to what is basically a medieval feudal/tribal society, the vast majority of who do not have any allegiance to the current, corrupt "democratically elected government.
The people of the USA and Britain are becoming increasingly uncomfortable with a war that looks to have no end in sight, whilst costing increasingly more lives. The respective governments are aware of this and what it might cost them in future elections. Therefore the decision is now made that we will withdraw in 2014/15 and the Afghan forces will take full responsibility for internal security.
Have no doubt that when that happens the Taliban will will move in and take control. The Pakistan government will then have to get along with them as a next door neighbour. You do not burn your bridges.