I don't think Universal wants to be responsible for broken switches after a day at Universal hints the wristband that connects with the switch once you go home.
I think though, wouldn't that be more of the guest's fault than that of Universal or Nintendos?
I'm guessing the Switch will get an App on the console/hybrid (along with maybe something on Mobile Apps) that connects you with the wristbands. The question I have, is if the App will be available globally at the time of 2020, or if it'll be JP Exclusive initially for the sake of it being first in Osaka.