There is always a scope of a limited war in kashmir. As Major Arya puts it kashmir valley is a 150 x 140 km strech of land and pakistan will not risk total nuclear annihilation for it. Pakistan wants kashmir for its water security. If India attacks to retake pakistan administered kashmir without opening other fronts the casualties of the IA will significant as pakistani will be ready in well dug positions but in th end it will be India that wins as Pakistan's smaller military and economic resources get exhausted and overwhelmed by the Indians.