If it is included, it would tell if the ball will hit the wicket or not in an LBW situation or atleast thats what its meant for. Now it is to do the thing as I mention, then I can't understand any reason as to how it wouldn't have any impact on dicission. That is because at some pointHawk-Eye would have been scripted with Respect to the dicission, if it suggests the umpire would give it out, you may see that ball is going to hit the stumps. I dont think you'll find that the umpire gave out and hawk-eye showed it wasn't going to hit the stumps. What Im saying is that, like cricket 2002 where the umpire judged the LBWs wrong so many times.I would say there, the hawk-eye should be usefull as to tell if that was an LBW or not, and if it was, the umpire got it wrong. This whole thing can also be refeered as a new feature. Like whenyou are given out LBW and the Hawk-Eye showed it wasn't out and then you get some interesting comments from the commentary team. This DOES happen in real cricket so why not in game.