call me naive, but i really think the pursuit for the new, the better, the interesting, is boundless and humans will never stop. and so for those of us that dream and push and are plain curious will never run out of ways to be useful. and hopefully the fruits of all this tech will be ample enough to support the ones that don't want to or can't participate in that way.
If AI is better at being (or simulating; I think the distinction is irrelevant in this context) curious, better at examining that curiosity, better at pursuing it to discovery, better at applying the discoveries, better at sharing the discoveries, and able to push the frontier of knowledge (if that’s even the right word) literally beyond human comprehension in every domain, what usefulness exactly is left? Or are you just implicitly saying you don’t believe AI will ever get all that superhuman?
We already drown in useful new things and especially knowledge. There's a limit to how fast we can adopt them.