What I am saying is, It will be Kargil half a dozen times, If we keep moving 20km and then stop. What is better Kargil once or Kargil half a dozen times ?
These mountain conflicts doesn't take much resources, donkey, mules, light weaponry and cannon fodder Jihadis is sufficient for them, remember Kargil even the rock is weapon for them. Which why Taliban, ISIS have used this method extensively and with a reasonable success rate given their resources.
They won't remain in denial once we encroach on their areas on a large scale, Dominating the LoC through fire power is one thing, It has limitations on what we can do. But encroaching the territory is different matter, what you are saying will cut the dog and leave it to heal, once healed, it may attack again and then repeat of what you said. Its better to cut the head once for all, If we mange to get our blade on his neck.