As someone who has been skiing the Wasatch for decades and skied over a hundred days there last season, including Alta, Snowbird, Solitude, Brighton, Park City and Canyons, as well as extensively back county skiing in the canyons between the areas, IMO One Wasatch has almost no value from a skiers standpoint. They have been selling Alta/Snowbird day tickets for the last few years, but nobody buys them because skiing more that one of those areas in a day does not really make sense, even though they are connected by easy skiing. Riding lifts from one side of the Wasatch to the other is not something knowledgeable skiers from either side would want to do. Unless you are simply trying to check off "areas skied" on your life list. All 7 of the One Wasatch areas have more than enough for a day of skiing, and riding chairlifts (and possibly freezing your ass off) for a couple hours to get from the PC side to LCC verges on absurd. People spend a lot of money to ski, not to spend time on lifts.
I support ending private traffic up BCC and LCC. The current free (with a season or multi-day pass) shuttle service is very good and could be greatly improved without a huge expense. Currently I can put my boots on, grab my skis, jump on a shuttle at Solitude and can be on the lift at Snowbird in under 50 min, or Alta in an hour. If I had to ride three lifts at Solitude, ski down to Alta, take a couple lifts and ski to Snowbird, it would take longer and most of the time would be spent sitting on chair lifts, which is not a comfortable commuting vehicle. It would also undoubtedly result in higher lift ticket prices to finance the additional lifts and avi control work.
From my experience the kind of skiers that come to LCC, as opposed to the three areas on the Park City side, are of different abilities and are looking for a different overall skiing experience. Sure, some would like to cross-ski, but not enough to justify building miles of new lifts. Connecting all the Wasatch skis areas by ski lifts and runs sounds like a really cool idea, but IMO it will do almost nothing to improve the skiing experience for people visiting or living at any of the areas involved. To spend millions to improve the marketability (which they will need to recoup from the skiers) without significantly improving the quality of quantity of the skiing is not something this Wasatch skier supports.