An interested perspective Sean, I, however, have a different take.
Regardless of the risk involved the decision of wearing a helmet really comes down to wether or not you want to look like a pussy.
Sure, many mainstream pro's still do wear helmets, but if you look at most street or park snowboarding nowadays they are nowhere to be seen. Evolution of the sport.
Even with edits such as the stept crew, sure they may not be the best skiers, but they are pushing the sport forward and it is pretty hard to argue. A trick without a helmet looks better, even if its only due to the increased risk. Due to this I think they'll become less and less common just like has happened in snowboarding.