Please check facts on the ground.
Not a single square foot of land in Jammu and Kashmir is owned by anyone other than those defined as State citizens under Kashmiri law.
There are Indians resident in Kashmir Valley, and these are itinerant labourers, bhaiyas from Bihar and UP, who work on road construction and civil engineering projects, usually in shanty towns, a privileged few in tents or temporary shelters. They are regularly killed by terrorists, and nobody bothers to write about it in the Kashmiri misery industry, aka media.
There are many more Indians resident in Jammu, and they too are without land. They can lease property but never own it.
There has been no demographic change in Jammu and Kashmir since 1947. You can check not merely from the census statistics, but from self-avowed separatists, who publish voluminously on every subject under the Sun.
I do not know where this argument started, but there are approximately 7 million (6.9 to be hair-splitting accurate) citizens in the Vale, and less than 350,000 soldiers and policemen.