That would be a very light statement in my opinion. World's strongest currency wont evaporate in air overnight.
Maybe not trillionaires but the currency did lose 98% of its' purchasing power since the 1910s. $10 million today, based on historic inflation, might only be worth the equivalent of lower six figures in 40 years. Of course the world, with all its' debt, is in a very peculiar state compared to the Cold War decades and inflation could surpass historic inflation.
In some ways most people already know this - there's a reason why the middle class, once getting their paycheque, puts their money into real estate or gives it to investment funds who promise returns beyond inflation.
On the contrary, Bitcoin is a deflationary currency in nature as its supply diminishes with time and demand increases. So, at some point, rather than real estate or other legacy investment funds, people may chose to invest in Bitcoin as a better store of it value.