Scenario # 1:
If IAF strikes and all or majority intruders (possible 4~6 planes at most, remember its a surgical strike scenario) are downed one way or the other and without achieving the objectives, this would be handled in a Political and Diplomatic environment.
On Pakistan side, no loss on the ground and instant humiliation of IAF. PA and PAF will declare victory (defensive victory) and India will be on the defensive for a failing strike, US will do damage control. Pakistan will humiliate India further diplomatically.
Scenario # 2:
If IAF strikes successfully (Isreal vs. Iraq style) and causes damage on the ground with minimal or no loss by IAF then PAF and PA will have egg on their face and will be pissed big time. Politcos in office will try to downplay the thing fearing for their own skin and power. US/West will try to tighten screws on Pakistan not to retaliate (Isreal vs. Syria recent strike style).
Scenario # 2.1:
Based on the history, mistrust b/w politicos and military will come into open again, a coup could ensue. And a retaliation might or might not follow as forces will be bogged down to quell the decent from inside. ISI might get "clear" orders with urgency and this time "old friendships of nafarious kind" will be rekindled...
Scenario # 2.2:
Military will force the politicos to pull the line, override the US/West and carry out their own "surgical" strikes. In an offensive stance and with the enemy waiting this could get "complicated" for PAF and GoI will use this as an opportunity to retaliate full conventional force. The MAD doctrine could ensue as soon as Pakistan feels cornered "conventionally".