Just wanted to put things into perspective about the NATO supplies through Pakistan into Afghanistan.
In 2009/10, when Pakistan had blocked the NATO supplies, 85% used to pass through Pakistan. They actually went to half rations that time immediately.
On
May 18, 2011, Lt. Gen. Mitchell Stevenson, deputy chief of staff for logistics, told the Senate Armed Services readiness subcommittee that U.S. brings in 60 percent to Afghanistan from the north through Central Asia and the Baltic states and
40 percent from the south
through Pakistan Army.
US intends to bring it down to
25% eventually.
The Army keeps
45 days worth of fuel on the ground in Afghanistan so that operations can withstand severe disruptions to its supply lines,
Source
U.S. Explores Pakistan Supply Route Alternatives - Defense News
I don't think blocking supplies by Pakistan will have any effect on US war machine. I think within a fortnight or even before US would issue an apology and this matter will be resolved.