Batsmen turn their heads away from the short ball more nowadays. And more batsmen will attempt the hook/pull rather than ducking or swaying out of the way. Helmets have led to batsmen generally not playing the short stuff as well as they did, and also to their being more aggressive against it - see Stuart Broad this summer.
Having said all that, this really was a freak accident. I'm not going to watch the vid, but it sounds like it was there to be hit. And batting does take a bit of bravery, whatever kit you've got on.