yes in future fiat would be replaced by crypto and i do believe by using crypto it would prevent money laundry and tax evasion. Goverments also will be much easier to track money of their people, i know its bad but i do think its also a good think.
No i totally disagree with your opinion buddy . we are already in the future but why do you think fiats are still here ? Cryptos cant replace fiats because cryptos are only possible online and we cant use it if theres no internet .
Money laundering is already temporary because on most payment method there is always a money laundering cases . now when using crypto , we will only increase the risks of it due to anonimity factor .
Lastly , you cant prevent tax evasion when you use crypto because you are actually evading tax when you use it as it is unregulated