This is the same boring alarmist argument we’ve heard since the Industrial Revolution. Humans have always turned extra output provided by technological advancement to increase overall productivity.

You’re right, who needs jobs when productivity is high.

It would happen in China regardless what is done here. Removing billionaires does not fix this. The ship has sailed.

You need to solve diseases and make the cure available. Millions die of curable diseases every year, simply because they are not deemed useful enough. What happens when your labor becomes worthless?

One of the biggest factors in risk of death right now is poverty. Also what is being chased right now is "human level on most economically viable tasks" because the automated research for solving physics etc. even now seems far-fetched.

Why do you think you’ll be able to afford healthcare? The new medicine is for the AI owners

You should read about workers right in the gilded age, and see how good laissez-faire capitalism was. What do you think will happen when the only thing you can trade with the trillionaires, your labor, becomes worthless?