Parvez Musharraf's claim that the US threatened to bomb Pakistan "into the stone age" if they didn't cooperate in the war on Afghanistan is a sign of how much pressure he has been under since that decision.
US diplomacy may well have sunk so low, but I doubt Musharraf would have needed that much convincing. There is no way the US would have attacked Pakistan like that. And if there was such a threat, why didn't Musharraf use that as an explanation at the time?
If we think Tony Blair is a poodle here, the Pakistan leader is known as Busharraf. The calls in his country were for him to adopt the same position as the Iranians - no use of our airspace for an attack on our neighbours.