Even if they did not.. It is financially impossible for Pakistan to sustain constant CAP's as it did in the Afghan war to contain intrusions.
A small blip that buzzes in for about 5 minutes and leaves leaves very little time for interceptions anyway.
So mounting constant CAPs as in the Afghan war would be the better option..
But those cause a wear and tear on the whole system.. equipment ,men and finances included.
No one expects PAF to go after each and everyone of them. Even if they manage to down one or two drones that should be good enough, its about sending a message and showing your intent.