I am not talking up on the hill to prevent. I am talking about at the tracks. They use them all the time in Europe. They make a small shelter over the tracks so the snow passes over. Your Gondi would be out on wind days. Even days with no snow. The wind can whip up that canyon on clear days as well as storm days.
Wind would be a non-issue. The 3S gondola proposed has 3 cables for a ton of stability.
Quick wiki search landed me on the Whistler Blackomb Peak-to-Peak 3s gondola...
The Peak 2 Peak Gondola has a number of unique safety systems beyond what a normal ski lift features. The gondola has high wind stability and is designed to operate in winds up to 80 km/h. Whistler-Blackcomb has called the Peak 2 Peak Gondola the most wind tolerant lift on Whistler Blackcomb. Testing at other Doppelmayr 3S installations have measured sustained winds at 120 km/h (75 mph) with no decrease in performance.