It'll be interesting to see how accommodating Universal is during previews if multiple attractions go down throughout the day for long periods of time.
Understandably, it's a preview period and that is expected... but there's also a pretty hefty price tag attached to it that guests won't be happy with if they can't get on anything. I mean, just a few days ago there was a period where all the E-tickets (Monsters, Stardust, Mario Kart, DK).