The theory has been tested in 1998, Kargil and again in 2001. You could not cross the IB on any of those occasions. But ofcourse, we were not at war with our other half during any of those periods which explains the conditions of '71 rather explicitly.
Strategic victory that has failed to achieve desired results even today??? Despite it costing billions of dollars and costing hundreds of lives at your end?? What about Mumbai attacks???? Seriously dude!!
Only the groups that are black listed by the US are banned in Pakistan, have we ever cared what you want? You could not even carry out a single 'surgical strike' mission despite several wet dreams of the same and with almost a million strong military at our border!
That is your reality, that is your limitation and that is the fact that you have to learn to live with.
If you read carefully, you would notice that I mentioned the mumbai massacre in my post, and the fact that the terrorists had to take the sea route, since infiltration through the border was no longer feasible as it was in the 90s.
It did achieve the results. Infiltration went down considerably since pakistan found it difficult to support the terror groups overtly.
The reality that you may want to live with is that Indian kashmir is now well and truly India's; pakistan learned not to wage overt war anymore since 1971, and even covert war like Kargil was not going to get you what you want. So fighting was outsourced to terror groups like LeT and JeM who used to openly recruit men and money on the streets in the late 90s. With op parakram pak realized that even that can have consequences, and had to ban both these groups.
Sure, there is still some infiltration every now and then, but nothing like the 90s. Indian kashmir is not going to pakistan, whether by overt war or covert means like lashkars and mujahideens. Pak has learnt that lesson.