[ambrood]

"The resolution recommended that in order to ensure the impartiality of the plebiscite Pakistan withdraw all tribesmen and nationals who entered the region for the purpose of fighting and that India leave only the minimum number of troops needed to keep civil order."

https://en.wikipedia.org/wiki/United_Nations_Security_Counci...

Given that the primary condition for the plebiscite was never met i.e. withdrawal of all the Pakistani forces, it was never going to happen. And while Article 370 has frozen the demographics of Indian J&K in 1947, Pakistani Kashmir is now majority non-Kashmiri. Plebiscite is hardly gonna happen now.