So many problems and flawed logic behind this test. This wasn't thought all the way through. There is clearly a HUGE disconnect with the decision makers and the actual guest. Basically it stems from three logic points: 1) people don't like waiting forever in long lines 2) people tend to and are able to spend more money when they have more time out of lines 3) guest surveys clearly show that guests are happier when they had a Fastpass for an attraction even if it didn't save them time or feel they needed it. #1 is a real problem that Disney really does want to solve. #2 is purely for profit and money. #3 is banking on the fact that guests are stupid, gullible, and are tricked easily.
Lab Rats
Congrats Disney, you found they way to trick guests but in the process completely destroy how society has been training to line up and wait to experience an attraction at a theme park. For a resort where a large chunk of visitors are actually first time visitors and for a resort experience that costs so much money to be a part of, you are gambling with people. Testing on human subjects as if their lab rats.
Downtimes/Delays
The return windows at Anna & Elsa were only 30 min time windows. I assume Soarin's test was the same. A portion of guests already have a hard time making it in an hour time window for Fastpass. Then when they do enter Standby+, they wait about 30-40 minutes. Who's to say that with an attraction that that wait will be accurate or guaranteed? What if there is a downtime or delay that affects both Fastpass+ and Standby+ to the point that Standby+ results in an hour wait? Wasn't the point of the new standby return times to reduce time spent in a line?
Starving an Attraction of Guests?
Another problem is counting on people to return as well. If people decide to leave the park early or can't make their return window, that spot is now wasted for someone who would have wanted it when they run out. If you experience enough of this problem, the hovering Standby+ wait will then decrease as well. You can see it in Fastpass+ time windows sometimes. There are times that aren't as popular and thus standby moves much quicker. Not enough Standby+ and not enough Fastpass+ may result in very short yet significant periods where they could quite possibly not have enough people to fill the attractions capacity yet you may still have people wanting to experience it.
Attendance & Wait Times
How would you use a system like this to be flexible based on different attendance days and how would you therefore inform the guests? For instance, Soarin' may have 200 min waits on New Years Eve, but on a random slow day in September may only have a 40 min wait or even less. Then you have to combat how to explain to so many different cultures and languages that even though the park is open, the ride may have distributed all it's return times for the day. 5pm sounds lucky for a busy summer day, imagine Easter! Could they be out as early as 1pm?! What if you are a first time visitor and lack of knowledge, choose to experience the other side of Future World first and miss out completely. Not to mention which attractions use this procedure and which ones don't like Living with the Land.
DAS Cards
Oh, didn't we also have a recent problem with GAC cards being abused to skip lines. Looks like DAS was the answer with return times based on the current wait time. Well, how will DAS work if the wait time is supposed to be constant, but return times vary. What if they stop giving return times completely. Now explain that to a child with special needs.
Multiple Attraction Conflicts
What happens when you have two attractions like Test Track and Soarin who use this system and you get return times around the same time? You will still have to wait in line for a time period plus experience the attraction. How would you make it on time to the other? What happens if you lose the card? Normally you would have just waited in line, it wasn't like you were getting out of line and loosing your spot, but with this new return card, you technically are.
Confusion with Guests
Eventually if this become common place, you would think a machine with the ability to print a return time would be beneficial, but many of these capable machines are being removed. If you tie it in with MyDisneyExpereince or the FP+ Kiosks, guests WILL get confused on which is which.
A Scary Thought: 3 Different Lines?
What happens if we now get three lines? One where you have to stand in a line and wait until there is a free spot, another for those with return times, and another for those with Fastpass+. Dare I add single rider to the mix?
Way to much to explain to guests who want to know "is this a ride or a show" and "where are all the rides at". Too much stress, too much planning, too much explaining, too much thinking, and too much complaining.