It's always a knee-jerk reaction when things like this happens. it's happened once in who knows how long since the last time, and i doubt it will happen again for a long time. because it did happen however there will now have to be massive crash barricades installed, a safety fence and safety zone or something which will ruin the event, and never need to be used...
it would be good if they just took it on the chin as an accident, and let it go ahead the same next year