And it will continue to ban snowboarding and snowboarder's are the group that is making it happen.
The Forest Service has already said they don't care. An operator can choose what style of snow recreation can use their lifts. You can hike over to Alta and snowboard down it when they are operating. They just don't let you on the lifts. That is how it is. All ski area operators on Forest Service land can do this.
As far as snowboarder's making this happen. Spending money at Snowbird funds Alta. Plain and simple. Alta has a joint lift ticket arrangement that they rely on to keep the ban going. They were going to allow snowboarding or go out of business 10+ years ago. Of course they hated it and the owners pulled off a last minute deal with Snowbird on the Alta-Bird pass. Though snowboarders aren't buying it, the extra income from 'Bird skiers allows them to continue with the ban. Snowbird supports them and it makes them money, after all they are not losing snowboarder business either. Now if snowboarders quit riding Snowbird in significant numbers and the Bird realized this, that joint lift ticket would die. So would Alta unless they allowed snowboarding. So when you go to Utah, I personally recommend riding anywhere but the Bird. Yes it's got great terrain, so do a lot of other Utah resorts with less crowds. As long as you ride Snowbird, you won't be riding lifts at Alta.