I hoping that situations like this can be resolved diplomatically without alot of drama.
I will also say that I think it would be prudent not to underestimate Pakistan. What ultimately ruined Iraq was not only the fact that they didn't have superior warfighting equipment. It was also the fact that they were unorganized and de-moralized from the start. Pakistan's military still has some pride, and will defend their homeland alot fiercer than the Iraqis defended theirs.
If we assaulted Pakistan, we would suffer alot more casualties than Iraq and Afganistan. Assuming that an enemy is inferior/easy to defeat is a huge mistake that no military leader will make. Also, the effect of our strained relations on the rest of the middle eastern world would be tragic. I think we have to relook at our current strategies, and concentrate on one thing at a time (although we will have to concentrate on two things at once - Iraq and Afganistan).
We need to clean up the messes we have started first before we worry about dealing with other country's bravado.
That is my humble Sergeant opinion. In the end, I just support the orders of my superiors. If my officers order me to roll out to the Pakistan border, my only question is "Where's my plane to catch?"