Grocery stores (Publix, Walmart, Costco, Trader Joes, etc.) and SeaWorld/Busch Gardens have already dropped masks indoors. I think there's genuinely no chance that Uni continues on another 4-5 months with masks exclusively enforced indoors. I'd be shocked if they don't drop the masks in the next month honestly.
As for plexiglass, I'd look at Disney beginning to remove plexiglass in attractions as a sign of what to expect for HHN (nothing).