I do not agree with this. There are more than two ways of responding to this. The US has been trying to coax/cajole Iran into action as well, but they haven't done so. They have not been succumbed by the US like Pakistan has. Neither has there been an open confrontation between the US & Iran, & I doubt it will.
Pakistan has a lot more leverage than the supply lines. It is probably most important country in the 'Afghan end game'.
What Pakistan must do is the following:
a) Build itself a stake in Afghanistan without burning bridges.
b) Not be seen (different from perception) to be supporting militants in Afghanistan.
c) It should clamp down hard on US presence in Pakistan. Whether that is the Shamsi Airbase, the Jacobabad Airbase that is being allegedly used, all CIA networks inside of Pakistan.
d) It should permanently, or at least indefinitely close the supply lines. Last time they closed the supply lines for about 2 weeks, the US got its bravado handed back to it, & apologized. This time though, the apology will not be enough. This attack is inexcusable, & has far reaching implications than just this incident.