AI would need to 1. perform better than a person in a particular role, and 2. do so cheaper than their total cost, and 3. do so with fewer mistakes and reduced liability.
Humans are objectively quite cheap. In fact for the output of a single human, we're the cheapest we've ever been in history (particularly in relation to the cost of the investment in AI and the kind of roles AI would be 'replacing.')
If there is any economic shifts, it will be increases in per person efficiency, requiring a smaller workforce. I don't see that changing significantly in the next 5-10 years.