The question then is if both of those rides open in 2021 (I could definitely see Cosmic Rewind delayed to 2022 if they want to push off one though) then there would be nothing of consequence opening in 2022. Not that such a thing has stopped Disney before, but it's helpful to have something to promote in a given year for marketing purpose.
Maybe we might actually get a new parade for that year.
'22 is supposed to be the second year of the 50th celebration, so, nothing new for the 50th seems to have been planned.
Although, '22 (or '23) was supposed to be the new SSE.