I'm going to make a prediction and say that this concept, once thru the test and adjust phase, will be rolled out to all of the major attractions across the resort. Once it's rolled out, they will then provide a means by which a guest can schedule their activities in the parks ahead of time, like maybe from your resort, in your room, or even at the park. So, you might log on to the scheduler from your hotel the night before or morning youre visiting Magic Kingdom and select from the attractions with queueless waiting and choose the ones you want to go on for the day, then generate a reservation for the time you want to ride. The system would then generate a list of all your reservations.
I could foresee them putting a tiered system in place for this as well where guests staying at the higher dollar resorts (deluxe & DVC) might get to schedule more attractions than those staying at moderate and values. For example: Guests staying at a deluxe or DVC might be able to schedule 8-10 attractions for a given day, versus a moderate guest might only be able to schedule 6 and a value guest might only be allowed to schedule up to 4 attractions. I could see them placing time limits on how close the attractions could be schedule together as well, maybe no more than 1 per hour, or based on the class of property where Deluxe and Moderates could do 1 every hour, and values only 1 every 2 hours.
I should add that my prediction here is loosely based on patents that Disney applied for more than 2 years ago as enhancements to Fastpass. Im just speculating here, but I can see where the groundwork for this is being laid.
For Disney, queueless waiting should be a win-win scenario, at least on paper. No longer will 70-90% of their guests be spending 80% or more of their time while in the parks standing in line. Depending on how many rides get upgraded to use this new queueing concept, guests wait time in line could be throretically reduced to under 50%. Im not a fortune teller, but Im guessing that Disney is hoping that something like this will encourage guests to shop, eat and spend more money. However, I have to wonder if it will. When we visit WDW, we usually go with a set amount that we intend to spend on food and merchandise. We plan carefully how much well spend on food, and the the rest is for souvenirs. Sure we occasionally spend more than what we planned, but its not a significant amount, maybe 10-20%. So, I have to wonder how many other guests are like us and plan their spending similarly. If they are, then Disney wont see a huge jump in spending from queueless waiting, and it may even cause them to lose money after all is said and done to add this technology and then additional technology and features to entertain guests waiting for their number/slot.