Untfortunately when world goes into critical times you can be sure more about true wealth and true wealth assets.
Off course when we have stable times no wars and other bigger issues then we can be sure about fake wealth assets.
The fiat currency in bank it's not yours there is too much risk that someone else can control this and even by mistake something can go wrong.
The goverment protection scheme only works when times are good but If goverments have problems with money then techically they cant protect or guarantee nothing.
The true wealth is something wich you have control over yourself not the third partie trust.
The only proof instead of trust will work.
The fake wealth: land, property,money in bank,stocks,bonds.
The true wealth: food in your home, paper Fiat currency money in your hands the pyhsical gold and Silver and cryptocurrency in your self custody wallet.
You trust your bank because it's regulated by goverment rules but your goverment can only give guarantees when times are good and stable.
So those who hold their money in banks in many countries definately will lose and If they don't have true wealth assets they go broke and homeless and nobody don't care because everybody else will have their own problems same goes for goverment leaders they got their own bills to pay and own problems to deal.
Those who can not think for themselfes and taking the full responsibility of their life they will be broke soon.
I hate to break it to you but crypto will be the first thing to vanish if the world goes back to war. Crypto has largely been able to prosper because we are so interconnected and it is useful for trading, however if things got serious like Russia/China/Europe/USA getting involved in a tussle, then you start to see internet lines cut and anything net based will suffer. The blockchain relies on the free flow of information, just like our banking system, so it will suffer too. It's also very weird that you do not put land and property into the same bucket as precious metals, because they are physical objects that you can control. Everyone also needs a home and decades of property grow would tend to disagree with your assessment.