If they make it so your LS can only have one at a time, then people will fight over the one that is "best" for PvP/hardest raid. If they don't put a limit on amount you can hold, then the top LS will hoard them just to grief. If they make them too weak, no one will bother getting them. If they make them too strong, no one will PvP against them. If they make them instanced, it'll turn into WoW.
Really you can't win so just stop worrying about it.
