I think masks are going to be plentiful from now on, particularly during flu season. It's been that way in some Asian cultures and I think a lot of Americans and other cultures will be adapting that for the forseeable future. Especially when going to a world wide tourist destination. Most of the world got lucky with SARS, everybody got hit hard by Covid-19, you have to expect the next coronavirus isn't too far in the future. It's a new reality until they figure out a long term vaccine that can defeat all forms of coronaviruses if that is even possible. I think our best bet will be annual covid shots just like the flu ones - ie based on what strains seem to be lurking.
I'm particularly interested in stuff like the Health Passports being developed to "prove" your vaccination status and/or recent negative testing. The ACLU, antivaxers, antimaskers, etc will all protest it, but much like 9/11 gave us TSA and enhanced security rules that haven't gone away, I think something that killed over half a million Americans in under a year is going to have long lasting results.
It will be interesting to see if HHN has beergardens like some people think but allow food an non-alcoholic beverages to be consumed throughout the park. While a lot of concert venues, theme parks, stadiums have stuff like that already, from a scientific standpoint, drinking a soda releases as much water particles from your mouth as a beer does. So that's a tough sell. And part of the benefit of HHN is you drink and have fun, but don't get drunk...at least with my group. And that's because we're drinking while walking 12 miles a night metabolizing the alcohol quickly as well as sweating it out of our system. Forcing people to stand around and drink in a confined area might theoretically cause people to get more intoxicated. And having everybody who's drinking being in the same area along with different opinions on masks with some people be violently opposed to them while others violently offended if you aren't wearing one in their presence, would probably lead to an increase in drunk altercations. A limit of the amount you could have a night might be the best idea, but that will go against the "spirit of the event" for a lot of people and would hurt Universal in the wallet.
Also, saying that everybody who is taking their mask off to consume food or beverages have to be in the same area and remain stationary doesn't sound like the smartest idea from a scientific point of view.
Regardless, there are going to be some rules that a lot of people won't like, but everybody needs to understand they are being done safety in mind. Some might be scrapped after the first week and others might be introduced mid-event. There's no roadmap for this.