These aren't Whaleback sized hills. Perhaps the best way to compare would be by terrain acreage and not number of resorts--then we could get a better deal of whether it really is a monopoly or not.
Interesting idea. In Colorado, Vail owns about 1/3 of the skiable acreage. Not even close to a monopoly. The purchase of Crested Butte only increased their acreage ownership in Colorado from 31% to 33%.