Why bother with corporations and government if you have AGI? Wouldn't it be a better coordinator than they would? (and if it's not, we can always go back to having governments and corporations)
If we couldn't for some reason, that would mean that the AI was, without being prompted by a human, actively suppressing the people's attempts to act in their own self interest (by collectively deciding not to listen to the AI anymore).
I suppose it's possible that an AI would do that, but it's certain that humans do that. So in this case I'd rather gamble on the devil I don't know.
I wouldn't be so sure about that...