I honestly feel sorry for this family but what happened was just a freak accident. A wooden bat could have caused the same injury, sounds as though it wasn't the velocity of the ball but simply that the kid was hit between heart beats. Baseball pitchers routinely get hit by line drives, perhaps pitchers should wear protective gears like cathcher to protect themselves from harm.
It's going to take a lot of money to care for this boy and thats why they're trying this misguided lawsuit; which I strongly doubt will be won. I suspect that this will not go to trial or it'll be settled ou t of court or dismissed by a judge.