What do you suggest people to do? Yes obviously you can pull the money out from the stock market, but how about banks? And even if you turn all that into cash, you mentioned US dollars will become worthless, so what's your advice handling our wealth?
There's been one potential cataclysmic event after another forecasted for as far back as I can remember, thankfully so far none have happened, yet. Not sure why none of them has happened yet, after all, each time things in the Church and world had gotten progressively worse, and each time "this time it's different because..."
All we can do is our best to first, stay on the right side of God, pray and receive the sacraments often, then have zero or as little debt as possible, and keep on hand as much necessities as you can. What else *can* be done in the case of impending cataclysmic doom when your money, if you can get to it, will be all but worthless?