I'd like Skyrim to adopt this feature by registering the groin as a separate hitbox (in addition to hitboxes for the legs/arms/head etc.) I think this would add tremendous strategic and immersive qualities to combat, extending the possibility for interesting combos and finishing moves. There could be some AMAZING finishing moves that target the groin. I'd personally like to see a whole category of groin-based finishing moves.
As a graphical flourish, the game world could be really fleshed out by adding some realistic renderings of medieval weaponry on groins. I'd love to wade into battle and specifically see the effect of an upward swing of a battle axe on a human groin, or a powerful thrust of a longsword to the groin. Bethesda could even get as detailed as modeling the difference between a thrust attack (like a sword or arrow) and a slash attack on a groin, but of course that level of detail isn't necessary.