Lots of different catalysts have triggered mass extinctions but the event they often trigger is a change to the ocean's microbiome. Giant influxes in fertilizer, methanation, changes to acidity, salinity, temperature, etc. Lots of things have triggered them but the end result is a change to atmospheric composition. It's why there used to be giant bugs and why they're not here anymore.

My point being, whatever comes next will probably be so different than us that it thrives in a very different atmosphere.