@Rudi Riet agree about TdF/Giro/Vuelta, but it's still slightly different then skiing. Cycling is more like xc skiing for example, where you can actually make some sort of isolation, even though I was actually surprised with TdF and all the people on climbs that there were no complications. But at time of TdF, real second wave in Europe was not here yet. We are just starting that now, and now, I'm pretty sure things would be different.
Anyway, with cycling or xc skiing, you can go out and train basically on your own, with closed group and noone around. For races, it's no (big) problem to close hotel and have only teams in one, journalists in the other one, organizers in third etc. and on slope you can somehow maintain this, even though on gondolas it's already hard not to mix different people. As soon as racing weekend ends, all this is gone. It's impossible to train on closed hills with noone else around. It's impossible for organizers to isolate for 6 months, and it's also impossible for racers to isolate for 6 months especially when they need to train in public slopes, use gondolas (currently we are still in time when most of skiing is done on glaciers which means either access trams or gondolas for 50+ people and few 100m queue on bottom station) etc. Another issue is that most of teams train together. With cycling you can have people training on their own, with skiing not so much. And when one guy tests positive, whole team is out, and in current time (and training), it's not just one team, but normally 2 or 3 teams, as it's normal, even in current situation, that different teams train together. In worse case, you can easily have 2 or 3 positive and 80% WC teams are in quarantine.
So honestly I just don't see this working. But yes, as you said, let's wait and see what happens. I hope for the best, but honestly don't have much expectations.