Is it, really?
With current progress I don't see humanity surviving even another 500 yrs, honestly.
The main intelligent race at that point is likely going to be something like a symbiont/cyborg that's part machine. At least nothing it'd consider
human.
Millions of years is a long period of time. Humanity has only existed for roughly 200-300k. That's less then 1% of the projected time period here.
