I like the OP's quote from Keynes. Airlines and other travel related businesses will do badly, as will restaurants and cafes, but people still need to buy food, clothes and building materials. Oh, and also toilet paper. Most business will not be seriously affected, once the initial panic settles down, which it will. For we oldies, living off investments, our dividends will continue, even if reduced. Staying solvent only applies if you have borrowed to invest.
I lived through the Oct 1987 crash. Saw a correction coming, but like everyone else, could not predict the timing or the scale. I did nothing and rode through the crash, and inevitable recovery.