This one is easy, masks are more durable and have less operational impact than distancing. Just look at a queue as an example. It’s much harder to create distance, changes the physical capacity, and it quickly fails if people squish in. Is that 3, 4, 5, or 6 feet really between people? Masks also shift the cost to the guest instead. As long as it’s not restricting attendance there’s no rush or incentives pushing to drop them.
I think they’ll go with yellow not blue too. But, I wouldn’t expect immediately. My guess, 2 to 4 weeks at yellow. So that it’s strongly at yellow and trending towards blue, not hovering at the yellow line drifting above and below it. They may say they can bring them back with no notice, but let’s be realistic, thats going to be a hard sell and unlikely unless it starts to trend really bad. The duration at yellow probably depends on the trend line and likelihood of it staying down.