Sir, we are not talking about USA. We are discussing IN, PLAN and PN. These three countries are nuclear powers and the equation as such changes when we talk about any kind of war in such environment, land, air or naval. We should not detach ourselves from the existing environment.
You are again talking about, what India may have in future without giving any time-frame. Stealth or otherwise, anti-ship ballistic missiles are a potent threat. Yes subs are also potent defence against an AC - PLAN have close to 70, how many does IN have.
Those subs are the main reason IN can't operate in South china sea. But almost all their subs are short ranged, and cannot come anywhere near andaman or IOR. They have only four subs that have that range, and those are highly noisy and of a very old generation, comparable to what USSR fielded in the 70s. They can be easily detected and neutralised by the P8-Is or other modern ASW assets like the kamorta class corvettes. And those four are the only ones that have the legs to come even close to Indian interests.