There is not going to be any US attack on Pakistan if US posses even a bit of rationality, these tactics are just to pressurize Pakistan to carry out operation in Waziristan just as done earlier but good to know the stance of COAS this time
US want to exit as soon as possible waging any war in Pakistan will not do any good to them it will not only delay their exit but also it will do following things
1) Any attack on Pakistan may result into possible unity b/w Pakistan and Afghan Talibans, so in this case US has to confront two at same time on two different fields , till today more than 1lac US/NATO military is unable to handle 4000 people let alone a fully equipped army that too away , they might get some short term success like in case in Afghanistan but in long term they will be stuck
2) Secondly there is soon going to be election in US and democrats will not want to have such spoiled image as the main reason why US people choose obama was for the sake of bringing back the peace but if Obama will continue on the same course , he better be assure that its last chance for democrats after that it will be bye bye to them forever
3) Any attack by US will destabilize the whole region , Pakistan is not iraq , if we felt a dire need we will not refrain from using nukes and that means the whole region will going to be ruffled
4) China will never ever let any such thing happen , and you know why
5) Any attack on Pakistan means continuous blockade of supplies to NATO and we all know they can't survive for a day if any such thing happen and without food and oil for how long they can fight?
6) Obama has so far failed to achieve what he promised to the US public and as result became the president so before they evacuate they want to throw all their blame on Pakistan to save their faces and avoid any situation like vietnam , coz so far since 1901 US jootay kha k hi nikla ha har jagah say
7) Finally , will it monetarily be in US favour to wage a war when their economy has already crippled?
8) Many countries have stake in Pakistan , so they will never want such thing to happen because of the strategic benefits , The proof is after such remarks High officials of Saudi intelligence agency are already in Pakistan in meeting with DG ISI and Chinese Vice President just arrived in Islamabad
Even still if US wages a war ,the sole benefit we might get as a nation is the restoration of unity among the nation