Life has undergone multiple large scale evolutionary shifts. Did it revert to the mean? Were multicellularity, photosynthesis, or sexual reproduction fads or bl

Life has undergone multiple large scale evolutionary shifts. Did it revert to the mean? Were multicellularity, photosynthesis, or sexual reproduction fads or blips? Obviously fossil fuel use must be a blip, but non-fossil sources have achieved exponential takeoff. This could be a new normal, with humans possibly being joined by synthetic AI lifeforms soon. This would represent a giant shift toward neural cognitive intelligent life as a dominant process in the ecosystem, a change similar in magnitude to the birth of eukaryotes or the Cambrian explosion. Or it could all blow up and fail. I do not have a time machine or clairvoyance. I’m just pointing out that one cannot make definite statements about what complex evolving systems will do, and many very unprecedented weird things have already happened in the history of life.