There are plenty of COVID-related changes in the world that have stuck around because COVID forced us to learn new ways of doing things, and in many cases we realized that these new ways were superior to the way it used to be. It's telling that Disney is the only cruise line that has gone back to the old muster drill. Maybe others will follow in time, but I expect that they'll only do it if forced to. Of course, Disney also did a pretty half-hearted attempt at the virtual muster drill too--IMO, it was executed much better on my Celebrity, Princess, and MSC cruises. Maybe Disney wouldn't have been forced to go back to in-person muster drills if they had done a better job on the virtual ones?