its not that they're ignoring the fact that the cryptos were destroying their businesses or stocks or the system of every nation's currencies
Cryptocurrency market cap is extremely small compared with other things such as stock and gold.
fiat or crypto? or both?
gold or crypto? or both?
Not directly comparable since each have their own usage. I doubt you can replace gold which used for electronic
what would happen if the world abolish the use of paper-made money and adopt whole-heartedly the effectiveness of cryptocurrencies?
It's very unlikely. But if it everyone only uses cryptocurrency, we need many books to write the changes.