Pakistan cannot live without US support in all fields. F-19 screw and bolts are to be brought from US. PPP cannot dictate terms to US. They are just reading what US's format given them earlier. This two timing of PPP will be safer bet for PPP to establish their rule for some time to come.
Unless and until PPP & Co., follow US, they will doom.
Recent attack on Afghan rebels is an indication that US do not trust the new government to follow what US says. But now they can hang on for some more time, until this coalition falls. it is very imminent, as these two leaders were at each others throat some time ago.
Like a proverb: Your enmy is my enemy. It is a matter of few months.