So, given the limits on what the discount applies to at Stevens, for East skier's if they did this it won't apply to Epic or Epic Local passes. And you could only use you $150 resort credit at eastern areas, not Whistler. So this would not help your trip there.
All this said, I do not believe there is a NH specific pass and certainly not an AttiCat or Crotched only products. Given VT has run much better and is accessible on the Northeast pass, I cannot see Vail tossing any discounts out here. If you are firmly entrenched at Crotched or AttiCat, that should probably piss you off. But they won't care. Stevens is unique, as anything else on the Epic is quite a hike, the closest probably being Whistler. But that isn't a simple drive and back with Covid restrictions in place. So Vail has to do something there, not sure this will cut it. Have a feeling they are going to lose a ton of Stevens folks, and I doubt they get many traveling there on the Epic from other regions given lack of lodging, etc.
You're probably right in regards to NH. Let's say Vail does 700k skier visits in NH. Probably a bit high, but I'm using that figure for easy math because New England Epic Pass holders use it an average of 7 days per season. Call it 100k passes. How many of those though use it exclusively in NH? Maybe half? The other half equally splits their time between NH and VT.
So of those 50k pass holders that are exclusively NH skiers, say 20% don't renew for next season. Is Vail going to care all that much about losing 10k pass sales when they sell 2.1M nationally? And that number only goes up with the 3 PA areas they bought this season.
Nope, they will not care about that slight drop in business. Not enough to perform considerably better in NH I'm guessing. Snowmaking roll out will still be slow. Lift operations frugal. Same short season. Crotched won't go back to 7 days a week. I hope I'm wrong.