I doubt it would change much.
The local are either NOT going to ski, or they ski in ... Alta/Snowbird/Brighton/Solitude!
Will they ski more because it's "one low price"? Possibly.
But if you look at Epic pass data (sorry I don't have the link, but I heard bits and piece of it as Vail collects all that info), there's a group who ski a lot. They always ski a lot of days anyway. There's a group that only ski so few days that they barely break even (or NOT break even!). They still only ski a few days!!!
Now, the population explosion of Utah, that's a completely different matter!