But the biggest thing is that I just don't think that there is anything resembling a steady-state outcome. There's a really interesting book called "Singularities: Landmarks on the Pathways of Life" from (oh, wow, time flies) two decades ago, which describes in each of its chapters a major biological transition whereby a new "technology" was adapted by a particular organism, and then rapidly took over the whole of Earth's biosphere, by virtue of enabling it to either utilize its environment better or evolve more quickly or both. Some example topics covered are: ATP, RNA, Proteins, Membranes, Oxygen utilization, Multicellular organisms, etc. Each change being so dramatic that whatever came before almost loses relevance.

I'm concerned about the rise of AI being the next such singularity, after which we humans would become pretty much irrelevant to the state of the world. Not just out-of-the-job, but similar to horses (or better yet coral reefs), living in some specific ecological niches, away from where the "interesting" stuff happens, with our existence in peril due to forces out of our control.