Seriously, this needs to be engraved somewhere. Wishing for the balkanization of Pakistan is akin to cutting off the nose to spite the face. The schadenfreude moment that the subscribers of this ludicrous theory seek is a mirage. A meltdown in Pakistan will not restore any pre colonial glory in India, the unfolding disaster will however abrogate any chance of future glory.
What would make for an interesting discussion however is whether Pakistan would benefit from an Egypt style revolution.
First of all, the existence of Pakistan as a state has no real basis. It is a totally unnatural entity created out of misguided notions of Islamic 'nationalism' and upper-class self-preservation in the context of great power politics and a convenient bonhomie between the Anglo-Saxon world and a pro-West Jinnah. The basis for Pakistan's existence was challenged in 1947 itself, when millions of Muslims chose to remain in India, and was essentially destroyed in 1971, when their fellow Islamic brethren in East Bengal seceded and formed their own state. As such, the 'balkanization' of Pakistan would not be so much a devastating meltdown as a natural unwinding of an ill-conceived aberration of a state.
Secondly, wishing for the balkanization of Pakistan is not so much about 'schadenfreude' but about advancing India's national interests and security. The fact is that there can never be peace between India and Pakistan,
period. The military-feudal complex that runs Pakistan will ensure that the Indo-Pak rivalry is kept alive indefinitely, because Pakistan as a state views itself in relation to India; as an antithesis of India. Some misguided Indians might hope that "eventually" the military-feudal complex will be overthrown and replaced by "Pakistani secular liberals", whoever those are, but the chances of Pakistan becoming a liberal, secular democracy living in peace with India are close to zero and is nothing more than fantasy. Indeed, based on current events the chances of Pakistan disintegrating are much higher.
Thirdly, the hypothetical balkanization of Pakistan need not make the situation worse than it is. Both the Balochi and Sindhi independence movements are secular nationalist in nature. FATA and Khyber Pakthunkwa should be returned to a pro-India Afghanistan, as the Pashtuns have never recognized the artificial Durand Line. Islamic radicalism, being a product of the Pakjabi gov't, should be restricted there. I think 30-40 years of Soviet-style forced atheism under an Indian puppet government in Pakjab can do wonders.