The issue for Pakistan is India economy prediction for 2050 is around 40Trillion PPP and Pakistan is 4 Trillion PPP, current India has 14 Trillion v Pakistan 1.4 Trillion. India will use its economic power to build a powerful military, especially strategic force, they will end up with alot of aircraft carriers, nuclear ballistic missile submarines and Pakistan will struggle to keep up. Today we need Nuclear Ballistic missile submarines but we cannot afford it and this is why our navy went instead for 8 submarines, an excellent decision looking at our situation. The future will be India will have 3x powerful military than Pakistan, if we have 12 Submarines they will have 36, if we have 500 fighter jets India will have 1500. I would say mid 2030s Pakistan could look at nuclear powered ballistic missile submarines but no matter what we will establish a minimum deterrence to defend Pakistan.