I'm an avid skier and the Ikon, Mountain Collective and other multi-resort passes do make access to multiple timeshare locations kind of appealing. The problem is most ski weeks in most systems are very high demand. After owners and various internal priorities, I just can't see much leftovers being accessible to peons like me. It sort of makes sense, if a system couldn't fill a ski resort even during ski season, how could they ever cover costs? No skier buys a ski week and then doesn't use it. And since ski weeks are expensive, most ski weeks are bought by skiers.
Honestly this is where a fractional is a better system. ie, 24 families share ownership of 4 ski chalets in Mammoth, Big Sky, Jackson Hole, Taos. Each chalet $3 million = $12 million investment. Each family = $500,000 all in up front plus maintenance fees but gets access to 4x52 = 208 weeks/24 = 8.5 weeks each, probably 2 ski, 2 summer, 4 mud. But access is nearly guaranteed, you get wide variety of locations, etc. August fractionals in Europe is doing something like this with classic European renovations in Paris, Barcelona, Mallorca, London, etc. Very appealing... if you can afford it.