Look I'm not in favour of revocation either. Now speaking about SF... their impunity shall remain as it is...it's just that their ROE would become slightly tighter than before. Right now, on ground, army sf rr and marcos are very very light handed when dealing with terrorists they even conduct their operations alongside police to make sure whatever they do is happening under the watchful eye of Law enforcers. I see it as a golden opportunity for NSG to get deployed over there for providing support and conducting unilateral special operations aswell.
Now coming to the diving stuff, Marcos, Para SF and NDRF will always be there for that. You might be knowing that NSG too has a diver unit that gets trained by CDs, Marcos and are sent on foreign training courses ran by SEAL teams etc.