We need to fight a short war and create a boundary of no go. This idea of our LAC and your LAC will only help them in grabbing more territory every now & then. In another 10 years they will squeeze us out of siachen.Actually if you're referring to Tibet exclusively, you're already not adhering to the 1 China policy. After all Taiwan isn't the only exclusive component of a 1 China policy. Both Tibet & Xinjiang too are parts of that same policy.
Secondly, if you're prepared to question the 1 China policy make sure you're prepared to get into a war with the Chinese too. Don't get into it otherwise. The shoddy example of Nehru's Forward policy is before you. Let's not repeat such foolishness again.
Secondly once we go back on one china policy we need to get more concessions from them instead of squandering it away. Need to have some leverage over the chinese.