I can see this being the biggest issue to be honest. Yes, attitudes towards germs and cleanliness will change but I think more significant will be the reduced desire to experience such an attraction.
I was thinking more generally about this only yesterday: how the market for horror and other spooky stuff will likely decrease in light of Covid-19. After half a year of pandemic-induced lockdown, the public’s desire to watch horror films/do live horror experiences/ride respiratory disease themed ghost trains will surely have waned as people reevaluate their lives.
I wonder if the themes dreamt up by parks in the years following this pandemic will focus more on adventure and liberation than horror. After all, isn’t escapism what theme parks are all about?