All my investments are in stocks. People tell me "what if the stock market goes to zero?" Well, then I'd lose everything. But consider this - if the stock market goes to zero, so does the bond market, so does the real estate market, so do hog futures, your NFTs, your collector car, etc.
The only thing that goes up is ammunition.
So sure, it could happen, but I'm not going to diversify, because that won't work, either.