As others have said, eliminating standby altogether is impossible. The park simply couldn't handle it. If you took a busy day, and instead of every ride having a large percentage of the people in 30-120 minute long lines, they were walking around, shopping, or eating, the walkways would be so crowded that you couldn't move. A parks overall capacity accounts for people standing in lines, so removing queues reduces overall park capacity. It'll be interesting to see what the criteria is for queue-less attractions is. I agree that the low capacity rides that back up will be the most likely ones to end up with this. This DM test may be just a test for Fallon though. A real world test of a similar ride to fine tune it and experiment with different configurations. How well it works with DM may determine if it gets to keep queue-less or not.