This, no one is saying there isn't going to be damage economically, but the OP is literally the definition of chicken little.... but as you said, the mechanisms, are sound, at least, to me they are....there absolutely will be tweaks to it....but for the most part, it works.
Today I read several articles about the travel industry and how devastating COVID-19 has been for them. It's one industry but it is a good example of what people here are trying to explain to you.
Boeing has shut all its plants. Delta has parked about 50% of its fleet. Air travel is down by approximately 90%. That means fewer people working at airports; TSA, foodservice in air terminals and on-board flights, less soft drinks and less alcohol is being purchased, which means fewer deliveries, fewer servers, cooks and bartenders, and fewer in-flight food preparation.
With fewer flights less aircraft mechanics and refueling personnel are needed, less avionics specialists, less air crew are required, less reservationists are needed. Far fewer people are booking flights than were 4 months ago. Far fewer airport maintenance and house keeping are needed now. Fewer people are renting cars. There are fewer people who work in reservations, who provide vehicle maintenance and repair. Air traffic control, engineers, airport police are much fewer in number now. The list is endless.
Hotels are almost dead. From executives to housekeeping people have lost their jobs everywhere in the hotel industry in America. Just as with airlines the suppliers for the hotel industry are hurting big time. Businesses who supply hotels, sales and distribution and rail and trucking are hurting. Warehouses are sitting on inventory they can't sell.
I'm barely scratching the surface concerning that one industry alone. Many, many, many of the people who were employed as part of the travel industry are on the street looking for work.
I'm here to tell you when this pandemic is finally over the travel industry is in no way going to flip a switch and have everyone return to pre-pandemic employment. There is a big likelihood the travel industry will never be the same for decades, if ever.
That is one industry and we barely even covered it. Boeing alone employed 166,000 people. Millions of people in travel-related employment may be permanently out of work.
The world is not going to return to 100% of what it once was in your lifetime nor mine. Not even close.