If they are smart, they will implement situations where the atmosphere in an area is hazardous and will easily ignite. That would force people to use melee weapons lest they deal with a grenade's worth of detonation with each muzzle flash.
Damned straight! Swords are silent, use no ammo & can be damaged if used incorrectly as well as through use, so they'll be perfect for stealth ops, especially after the "wear & tear" enters the game. Odds are that they'll take the place of a primary weapon, so a stealth assassin set up wielding the crossbow, a sword & a knife would be a perfect combo. Perhaps add in smoke grenades for the sakes of concealment, distraction & evasion & you'll have a future ninja in the making.
