Well it is Pakistan's choice to make. India has a lot to gain by having friendly relations with Pakistan, but not much to lose if relations are hostile. At least, not as much as Pakistan stands to lose. As the author says, jihad against India is a lost cause for Pakistan. Indian Kashmir is no going anywhere. If Pakistan keeps infatuated with that pipe dream, and this jihad-culture is kept alive in the vain dream of getting Kashmir, Pakistan CANNOT prosper. It is a fact. On the other hand, India can easily keep fending off all attempts by any uniformed or non uniformed Pakistani groups, while growing stronger by the day. It is a fact, whether you choose to accept it or not. India is too big for Pakistan to be anything more than a minor irritant to it.
Imagine this scenario. Suppose India has a national fixation in trying to take Tibet from China, and keeps spending on the military with that delusion. And furthermore its citizens idealize religious nutjobs who train for a jihad against china, and thousands of its men are recruited and trained to cause trouble in Tibet, and they all die at the border or get killed by china. Do you think India will have ANY hope of economic or social growth, if that was India's national fixation, the only dream that gives the nation a sense of purpose? What do you think India will look like in a few decades from now?
The ratio of China's economy to India's is not as big as the ratio of India's to Pakistan's. Nor is the strength of its armed forces. These considerations should give you an idea why people look at Pakistan with pathos when many of its people make these ludicrous claims of "supporting the Kashmir struggle" or "waging jihad against India" or taking Kashmir from India. Unless you learn to forget about India completely, except maybe as a trading and cultural partner, there is no chance for Pakistan to become a modern, prosperous, stable democratic nation.
India is more than happy with the status quo, and has the ability to maintain it for the next 50 years. She will only grow from strength to strength in the meantime. I'm not talking about any superpower delusions, but it is a fact that India is on its way to reducing poverty, becoming one of the strongest military powers, and one of the biggest economies. But what the status quo is doing to Pakistan is another story. So if Pakistan chooses to keep this particular status quo, India has nothing to complain.
Looking at the mindsset of so many Pakistanis, I agree that friendship may not be possible. But that is Pakistan's problems, not India's. India is more interested in building friendships, relations, and partnerships with bigger players.
Adding later: The post just above mine affirms my point.