Burning Man's been dying slowly since about 2018, so pre-Covid. When I say dying, I don't mean "getting mainstream & EDMified" like all the old Burners have complained about since forever. I mean, the mainstream has stopped taking interest, and increasing portions of the tickets are getting taken by internationals because its passé in the USA, but still on some people's travel bucket lists. This year was the first year in a while with extra tickets available, but the writing has been on the wall for a while.
I'm sure raving will come back in 20 years like most fashion.