Cryptocurrency wallet wealth is tangible wealth.
It's your "james bond moment" like agent to move wealth with you or store or save.
Your wealth in cryptocurrency will be still existing until there is smart phones internet access and Electricity.
Untfortunately i don't know how people gona move or store safely the gold or silver.
Untfortunately country currencies wich not on blockchain allready not safe, right now usa got trough USDC and circle their dollars in safe blockchain in times of wars and crisis also there is euro EURC by circle,congrats to Europe and usa citizen your currencies are pretty much safest.
Once UK been the powerful and wealthy and kind of smart yet they have not transfered their wealth over to blockchain and cryptocurrency means no security and safety of UK £ or UK assets.
Also TETHER, USDT got
Tether (USDT) is primarily pegged to the United States Dollar (USD), but it also has versions pegged to other fiat currencies, including the Euro (EUR) and the Japanese Yen (JPY).
Also chinse and mexican currency on tether so those countries are smart and prepared.
What the russia uk canada and many others think ? It seems like they purposly let their nations to crash down and no assets safety no stablecoins nothing.
So the statement is clear If your wealth not in cryptocurrency you not safe.
Sounds good, but there are nuances.
As we can see - cryptocurrency does not give a guaranteed, stable growth, and often leads to a loss of value. The volatility of cryptocurrencies has not gone anywhere.
Therefore, crypto as an asset for daily storage and use - already a bit dubious.
Diversification is the answer here.
The second subtle nuance - if you find yourself in a situation where there is no internet, or access to a wallet - you ... you simply have no means of livelihood! At all ! And even having a hardware wallet, you will not be able to use it to buy food or refuel your car ...
So the second answer - also diversification !

And in general - to trust and trust only one asset - this is definitely not dangerous ....