Well Powdr Corp does seem to care about Park City, but look at how they treat Bachelor. That area is in need of some serious attention and they don't seem to be interested in giving it any. I believe they had to close some chairs last year due to them not spending the money on maintenance. I know Bachelor locals are pissed at how shitty that resort is ran.
Here's some of the possible fall out I see from this.
1. I don't see Copper as being able to survive as a single resort operating in Vail resort territory. Sure Loveland has pulled it off, but Loveland is a much shorter drive not requiring you to go through Summit County. I see no advantages to Copper that would attract people to get a season pass there instead of the Vail resorts option. In that scenario, I would see Copper dying a slow death, opening up a sweet new spot to go earn your turns in 5-10 years. Of course real estate there says this probably wouldn't happen. I could see a lot of huge lawsuits from property owners at the mountain over this. Still, buildings in shoddy repair, lifts constantly breaking, etc, will probably become the norm.
2. Part of the reason we in Colorado have enjoyed relatively cheap season passes to major resorts is the Intrawest/Vail resorts two way fight. These two have kept the prices down. Before that, it was almost $800 for a season pass to Winterpark, Breck, or Keystone. Pick one and that is where your season pass was good for. There was the old Summit pass in the early 90's that went for $800 for all the Summit County resorts. Either way, without the competition from Intrawest, I am not so sure Vail resorts will be so motivated to roll out the pass deals they have. I could easily see them starting to charge $800 for their Summit county spots and $1200 for Vail/Beaver creek again. Everyone else would quickly follow suit.
3. Of course Intrawest and Powdr Corp may realize they don't have much of a chance running as single entities vs Vail resorts. So maybe they'll figure out a way to keep the combined offer going. Maybe. I am not counting on it with the brain trust that is running both of these corporations...