All of Bungie's weapon balances have been based on PvP even in the area of sniper rifle ammo. Also consider that for them to remove the Arc element from the gun it would no longer be the Supercell or have an exotic chaining property. I seriously doubt this would happen and at the end of the day people should use what they want, it's a game. I frequently do Mayhem with the Hardlight just to make people have the reaction "This idiot is using the Hardlight in Mayhem". It's fun.