As I see it there are 3 broad possibilities for the future of AI.

1) it works, knowledge workers are replaced wholesale, no one is earning enough to buy anything anymore, the economy collapses.

2) it doesn't work, the investors start to demand results that cannot be delivered, the speculative bubble bursts, the economy collapses.

3) it doesn't work, but it's sold to incredulous buyers as if it does, this looks like option 1, but so much worse because there's nothing of value to buy anyway.