Pakistan can and will sustain a conventional war. You folks keep on underestimating this fact. I am not calling for a war but I can tell you that Pakistan won't give a damn even if it has to default if need be. Countries have defaulted on far lesser pretexts than a war and in the overall scheme of things if a war begins, Pakistan's default won't be the headlines.
Also let's remember, Pakistan has never fought a war with ANYONE's backing, not Amreeki, nor Cheeni or Arabi.
And lastly, it won't be Pakistan that would initiate a war but it will respond with effect to what India does.