Pak will not be blacklisted as they have this knack of blackmailing the world into believing that if put in the Black List, 'Pak will be destroyed economically and split giving a free run to the terrorists to take over their nuke assets which will pose a grave threat to the world at large'.
Not really anything concrete or decisive for that matter but I was browsing some American military forum and they were discussing this exact scenario.
Most were not talking about why Pak must survive but rather what unit and strength of troops to deploy to take over their nuclear silos and prevent it getting taken over by terrorists if an armed conflict with India breaks out (this was right after Balakot).
The US veterans utterly hate the Pakis.
Now, not to be swayed off topic, and I'm sure it has been wargamed by the Indian Military on occasion but what would be the Indian Military's method of attempting takeover of nuclear facilities?
Airborne troops? We don't have enough.
Special forces? We don't have enough.
Regular infantry? They'll take too long.
Do we have a planned response to prevent the nukes going off or are we going to rely on the restraint of Pakis and take solace in the fact that we'll just make a bloody well mess of their country if they press the button?