If AI causes a mass displacement of academic workforce, good luck finding a job in any of those sectors you just mentioned.

I live in Finland, the country with highest unemployment rate in OECD. Over here hundreds of applications for one cashier, warehouse, coffee shop, bakery job is perfectly normal. It's not realistic for some random unemployed IT guy with no field specific experience to find a job in them right now. In case of AI job apocalypse, I would imagine the situation would look similar elsewhere as well.