Six flags parks have had qbot for a long time and have had the newer version of qbot for like 2-3 years. The new qbot allows you to setup rides in advance .
The system that disney is testing out is doing this. It doesnt cause any extra problems at six flags parks so I cannot figure out why people are complaining about it at disney.
They way jimhill is saying how the testing is being done makes it sound like it dumps them into the normal fastpass line. I do not see this causing any major problems because these people would have normally gotten a regular fast pass anyway. I can see this actually helping to make fastpass lines shorter.
The Six Flags System is literally a virtual queue, not a reservation system like Disney nor a Line Jumping system like Universal. You receive a digital device and select your ride. Then you wait for however long the wait time is before you can go to the ride. My issue is with the cost, and how Six Flags puts up signs to force you to buy it (There are "30 minutes from this point" signs at the boarding platform!!!)
My understanding of FP+ is that they will come out of the current FP distribution, so there shouldn't be any effect on the standby waits.