Everything :) It is not a good answer if we are about inventing something very new, but my secret hope is reinvent something very old, something that really fits out biological natures but was lost during civilization, and thus solves a lot of problems at once, a lot of problems that all stem of not living in an ancestral env. So I am thinking about somethng as fun as soccer, as fit making as deadlifts, as proud making as boxing and as sexy feeling as tango. Because I am hoping when we are not having fun, are not being fun, being timid or not feeling it will turn out it all comes from not living an ancestral life yet that can be simulated.

I understand it is a bit unlikely, as evolution does not optimze for having made a perfect golden age. But there is a small chance humans did i.e. 100K years ago with similar brain sizes but far simpler env, far fewer variables, they figured ways to live happy, fit, sexy, proud etc.

I mean how else can soccer be so much fun or dancing so sexy etc. if they do not tap into something in the brain that is really old? I don't think they simply overstimulate circuits made for something else, maybe yes, but that is not the only option, the other option is that there were some ur-activities they all derive from.

So there is a hope that this is only a reinvention, hence the "everything".

Even if it not a reinvention, optimizing for "everything" can still be salvaged if we show most elements are synergistic.

Finally, it is about what they are optimizing for, not me. Hence the question what is trending.