1. Firstly CPEC will never replace a ocean route for trade in china,whatever be the reasons like land will be closed for 3 months due to snow,underdeveloped westetern China which connects CPEC or the high cost compared with ocean trade so CPEC complement the existing ocean route a large part of it already dominated by Indian Navy and the world knows it.
Secondly yes we lost our land in 1962 which was Aksai Chin,Chinese offered us that they will give up their claim on South Tibet (A.P) if India is ready to give up the claim on Aksai chin during Rajiv Gandhi's tenure but now they are reluctant.
IMO China can't be trusted,nobody knows when it could strike unexpectedly,look what it did with Vietnamese in 80s
So that's where our future induction of S400 could be a game changer coupled with brand new strike corp a tank regiment of T 90MS,Rafales and AH 64EE .... Dragons only loves the language of danda and that's how he will be tamed.
Plus we also have Japan,Viet's and US on our side now,who knows one day 2. we will house Ohio class submarines in Andaman.