IMO they are here to stay. 2022 and beyond. Unless attendance falls off a cliff.
Why would Disney give up that kind of control when it doesn't seem to be turning people off enough to not spend their money there?
I don't think we will know of the impacts on attendance until after the pandemic is over. The crowds they are getting now will attend no matter what. But, families like mine, that would normally spend 8-10 days on property once every 2-3 years will be less likely to go back. Yes, mine is just one family. But, we can't be the only ones.