There is only actually one reason sc should be nerfed: Balance. Well, duh. But these main 2 melee abilities were actually decently balanced; SC and throwing knife. Bungie ruined how Knives work (tried and tested, completely different) so SC is probably next. Nothing to do with how good it is in game, its been tried and tested by many Warlock and Hunter mains who say its powerful but unbroken, but same as the Knife. The 2 are very similar abilities in terms of power, so Knives will drag SC down.