That's the issue. We don't know what would happen but if what you said were to happen, governments will ban AI since the current economic model (capitalism and taxation) will be render useless and society itself will demand it (AI ban).

What if a different statistically just as likely utopian scenario happens instead and we generate more jobs than we can keep up with because we start colonizing star systems as a result of using AI tech to discover some new propulsion technology? What if AI can't do anything useful without a human in the loop to guide, monitor, assist? What if groups of humans augmented with AIs are far more powerful than AIs alone? What if the implications of that are that we create advancements in biotech, energy efficiency, software and information systems, interactive entertainment, agriculture, production, mineral extraction, etc that cause an explosion in jobs?