Normally, we need to occupy it before the Chinese move in. Or we have to retake it by force, but is unlikely to happen. The issue being both the IAF and IA are a minimum half to a generation behind.
Recall QRSAM? After Akash failed this requirement, the IA wanted 2-3 regiments of SPYDERs as stopgap before DRDO's QRSAM becomes ready, but this was 10 years ago. Same with Spike, the IA wanted a stopgap before MPATGM comes in, but we don't have either one today. So the IA today lacks SAMs and ATGMs. DRDO had promised to delivery both within 4 years, 8-10 years ago.
And now artillery, ATAGS can only be used against Pakistan. 400 ATHOS would have kept us half a generation or a full generation ahead of the Chinese, but that failed too. We are already a generation behind in rocket artillery, the IA wanted more Smerchs, but DRDO killed it. It's taken over a decade with Pinaka to catch up with some of the Smerch's capabilities, but it's still not there yet. Funny thing is ATAGS isn't even an official program, just another one of DRDO's hobby projects they decided to thrust on the IA.
IA can still fight with older systems, but just like Ukraine, we will face more casualties. For example, more than 90% of our artillery facing China are fixed 105mm, 130mm and some 155mm, and none of them are survivable. 50% destruction in a matter of weeks, 80-90% destruction in a matter of months. Even knowing this they will fight, but we will only be sending them to their deaths.
This is how important those 400 ATHOS were. The same with SPYDER and Spike. But this govt's priority is to not fight any wars, so the Chinese can behave aggressively and the IA has time to modernize.