60% of adults in the US are directly involved in the stock market in some way. Then there are all the ones indirectly involved (working for employers that are publicly traded, etc).
Where do you come up with this "~80%" number of people not involved?
It's estimated that 130,000 people retire each year. 130,000 people retiring in the next 365 days, who are now watching their 401K, 403B, mutual funds, etc, go into the toilet.
"Hey retirees, just hang in there for 5-10 more years, for your retirement funds to recover"
Meanwhile, company stocks are getting devalued. Price drops lead to selloffs. Selloffs lead to fewer people investing. Fewer people investing leads to less money for expansion, maybe even contraction as the company braces for hard times. Financing lanes get tighter. Dividends are likely to fall, making the stock even less attractive. Long-term returns suffer, pushing more sellloffs.
MAGA winning?