I do believe, and hope, that destiny will have swords in it. There have been a couple of hints by deej that this is the case. Anyway I think that if swords really are in destiny, that they would be an individual weapon assigned to the special slot. I can't see them in the primary or heavy slots for two reasons 1 swords probably wouldn't be reliable enough to be placed in the primary slot. You couldn't run around with a sword while everyone else is brandishing a rifle, you would get shot full of bullets. 2 I dont think that swords would be able to put out the high amount of damage that the heavy slot is meant for, and if they did, having a weapon that doesn't need ammo do as much damage ad a heavy weapon is kind of op imo So I can only see swords realistically being placed in the special slot, as a cqc weapon for special situations, much like a shotgun but with shorter range and more damage. All the weapons in the special slot have their merits on certain situations, and if swords do exist I think this is where they will be placed. A sword would be useful if I were being swarmed by thralls