Ahh but the displacement of work by AI is different then the displacement of humans by AI.
I would agree that if we create really good AI then there are going to be huge economic impacts.
But if you want to take it to the next step and then suppose we as a species are going to be replace by AI and that it is going to be our master or whatever. Then in order for that step you need not only really good AI but a way for AI to replace our bodies as well.
If that's the case then the AI would need to then design, one generalized or more likely 100s of specialized, machines and then field them in the millions.
I'm not saying it can't happen. It's just that A needs to come before B. And for however long it takes for AI to happen, you then need to take even more time on for the machines to come along after that.