I really think it has a lot less to do with what's on their feet than age and attitude. Come on guys, when I was young and dumb on the ski hills boards didn't exist and everyone still complained about the dangerous 16-19 year old idiots who skiied like nobody else mattered and periodically caused dangerous collisions.

It's not snowboards - it's just youth, speed, and testosterone. It'll always be a potential problem, and how much it is a problem will be directly related to how much people are educated on etiquette and safety and how well it's enforced when there are transgressions.