The problem with BTC and other currencies will be that you will no take any $$ - > banks are already starting to refuse transactions.
after 2025 BTC , ETH and so on will be worth real 0
As far as I know, most banks around the world still do not support cryptocurrency when it comes to conducting transactions from bitcoin or crypto to the bank, the number of banks open to bitcoin and cryptocurrency can be counted on the fingers.
Then how do you know that Bitcoin and ETH will have zero value by 2025? what is your basis? Your evidence must be strong on this matter.