Well, the problem is the guys are just hitting the ball so hard these days, they're working out in the gym building up their physiques and they're hitting that ball incredibly hard. The run chases are getting higher and higher and the guys have to go for big shots. I saw Joss Buttler hit one this evening that went like a rocket, you get in the way of that and you'd really know it.
It would make sense for the Umpires to wear helmets, it's got to come - and maybe even body armour like Baseball Umpires - the chance that an Umpire could get seriously injured cannot be allowed to happen.