The flip side of that is that at least half of all white-collar work was already useless before AI. If it hasn't already been eliminated, there's no reason to assume a-priori that AI can eliminate it.
If half of all white-collar work was useless before AI, and AI can replace those workers, then one can logically conclude that AI is useless.
Not completely. It just means you can have an AI do the useless busywork instead of a human. Something can be economically useful but still have proponents in a firm.
A lot of the "useless work" is busywork you do being a part of an executive's empire so they can claim they managed X number of people.
How can it do that?
Call your project Gas Town, write a blog about it, and investors will be swarming all over it thinking managing agents is even more impressive than managing people.