Well sometimes you gotto make take tough decisions. Pakistan has almost cleaned up the mess on its western border, and the remaining threat that emanates from there can be taken care of by the paramilitary forces. The troops are already war ready, battle hardered and rearing to go, think of the operations on your western border as a warm up match before Pakistan plays the actual match on the Eastern border. Pakistan will never ever impose a full scale invasion to take Kashmir from India of course. But an operation along the lines of Kargil cannot be ruled out, not to forget that Pakistan has more than enough assets still stationed on its eastern border to fend off any challenge from India.
Yes of course Pakistan too is growing, although at a slower pace than India. When Pakistan grows by 5% it adds say 10 Billion dollars to its economy, when India grows by 5% its adds over 100 Billion to its economy. Hence the widening gap.
In 10 years India would be atleast a 7 Trillion dollar economy, good luck trying to take anything from India, so this is the only window Pakistan is left with. It would be like Vietnam trying to fight China over South China Sea.