In my opinion, India is very stubborn and ready to sacrifice their over billion people to die but would never give up Kashmir.
India can not win the conventional war with Pakistan using their artillery, tanks, infantry forces, as Pakistan is much ahead in technology capable to destroy their tanks in no time. Indian tanks will have no choice except to run away.
The only option is left with India to use the Nuke. But Nuke will also affect their own people. It is strongly suggested that two countries should sit together. Allow both the parts of Kashmir as one independent country to settle the issue once for all