No way they will do this. Sure it should be an option for someone who wants the tough road but will turn off others from playing.
Think of a noob, who may want to jump onto the COD franchise, they will be put off being 'owned' every single game playing in a lobby with 2+ KD. They will end up being cannon fodder and ditch the game altogether.
Better to matchmake with people within +/- 0.5 of your KD.