What you're forecasting is a scenario where total output has substantially increased but no one's hiring or able to start their own business. Instant massive recession is by no means a "sure bet" with technological improvements, especially those that make more kinds of work possible than before.
I'm not forecasting that, and it's a virtual strawman in the face of my much narrower claim: that wages depend on marginal labor demand and bargaining power, not average output per worker. If AI substitutes for labor, the marginal value of adding another worker in many roles can fall. That can mean fewer hires or lower wages in some categories, not 'no hiring' or an instant massive recession. I have no idea what the addressable market or demand for our more productive economy is, but for the record I do hope it's high to support new businesses and a bigger pie in general!