There's no way around it. COVID is everywhere and people get it from being exposed to others that wear poorly constructed, poorly fitted, poorly worn, or not wearing masks. It's that simple. We are relying on the people and community around us to not be idiots, and as you can see from the spread, there are idiots everywhere.
I would imagine there are days in VT where skiing won't be a big deal, because there won't be crowds. In fact, maybe even days that are amazing because there won't be crowds. But on the flip side, there will be days that are super sketchy and annoying and complicated with reservations systems, long lines, slow lifts, etc. It's not ideal for day travelers, weekenders, and holiday skiers, and that will be a lot of lost revenue.
The only way the mountains are going to make it safe is by limiting the number of people there, enforcing mask wearing rules, and closing all the places where people can congregate.
At this point the state of VT can't afford to do anything more than they are doing, certainly not anything that would be logistically realistic (like testing each person that arrives at the mountain), let alone economically (like banning everyone outside of VT).
après ski is done. Putting boots on inside in the warmth or sitting down, not happening. Adapt or don't ski. Support your local mountains and ski local if you can.