These xPASSes won't be free, and there's a concern that relatively poorer guests will be left out.
In a way, this is Disney going back to the past. For the first few decades of Disneyland, all the attractions cost money. You had to buy a ticket book with tickets in various classes and spend those to enter attractions. Out of "E" tickets? Time to buy another ticket book!
This had two effects: the obvious one was that people were more choosy about which attractions to ride. The second one was that people would spread out across different kinds of attractions, since they had to spend tickets of different class. In the early eighties, Disney introduced a premium day pass that allowed unlimited rides for the whole day. These days, day passes are all we have, and the prices are still pretty premium.
The problem here is that you can't actually ride as much as you'd like. Disneyland can only produce so much amusement in a day; each attraction can only accept so many people. Since people don't pay with money, they pay even more with their time. Want to ride Crush's Coaster? Are sure you want to spend two hours of your time in a queue when other attractions are a walk-in? (Incidentally, I think most people are really bad at estimating the wait-to-fun ratio and getting the most fun for their time.)
Disney has been reluctant to actually charge more for a better park experience. Sure, money can get you a nicer hotel room and a good meal, but Disneyland itself is the same for everybody. Now, these NextGen passes – whatever they will be called – are supposed to be available only to guests who book an entire vacation ahead of time. Beyond just meal reservations, you will now get an itinerary of every attraction and show you will attend during your stay.
This solves a lot of issues for Disney, and guests as well. They can steer people into unpopular time slots, reduce peak crowds and ensure that no attraction runs under capacity. On the other hand, it does spell a situation where only affluent guests can buy the very best experience.