Baitullah Mehsud dead:)

I dont think they want to spend all their resources on WAZIRISTAN.. Its common sense.

There is a reason why most of the Army is still on the Eastern front. Pakistan needs to ration its resources. If it were to send valuable resources on a realtively softer yet still difficult target in S Waziristan, they would end up being to weak to counter a potential threat from the real enemy to the east.

They simply dont want to spread out too thin.

Also, in waiting for equipment from the US, they can get high quality stuff to replenish their already existing resources.