You're actually helping me make my point: Even if their own currency gave them the illusion of stability during their lifetime, that can only mean they have no knowledge of history or other countries where currencies have crashed. Hence, their illusion is based on having a meaty head.
I think it's fair to say that the crypto boom has greatly increased the general public's sense of the slippery nature of money.
The main other way you might get that broad understanding is by close exposure to currency collapse, hyperinflation or extreme volatility.
It's kind of a tribute to the USD that it's so mindblowing when people figure it out.