Definitely added crowds, and I know there are locals upset. Went to Jackson Hole and Deer Valley last year and heard an earful. I understand completely. Squaw Valley also is impacted. The Epic Pass is also causing some heartache, especially in CO.
The thing with Deer Valley is that they are a premium ski experience, or so they say. Season tickets are over $2,000 per year and people are paying a lot of money to ski here. When people can come here at little cost, then it really impacts those who pay premium dollars for the experience. I think some of the changes in attendance last year was due to an exceptional year for snow, but the Ikon impact was also significant.
Another interesting tidbit is that there were Ikon passholders that were brown bagging their lunches and tailgating in the parking lots. This is frowned upon by Deer Valley.
I think that Deer Valley is at risk at damaging their brand, and should be careful about how they deal with the Ikon people. I wonder if they will add a premium to Ikon passes for Deer Valley skiing.
We have also seen increased skiing at Park City due to Epic passes. I don't think the impact is as severe as Deer Valley as it is not a premium experience. The big problem however, is the lack of parking availability for those driving to the slopes. It will be interesting to see how this all evolves.