PROBLEM IS too much blood have been flown from both side ... so the idea of any change from status quo is Utopian.I actually don't think Jammu wants to join Pakistan, nor does Leh (not sure about Kargil), but the only way to prove it is to hold a plebiscite there as well. There are hate mongers on both sides, to squash them and their narratives, this is the only solution.
Plebiscite was possible within a few years of when it was proposed. After 65-71-siachin-kargil and current ongoing mini war its next to impossible.
One option is to Change LOC in IB with option of easy movement / visa free corridors for both sides of Kashmir.