Crypto has been around for about 13 years and the number of users according to reports from many trusted sources has reached about 8% of the world's population, of course this is a fantastic achievement in a short time, but I believe crypto is not the last technology and financial system.
there will more breakthrough in financial technology which is maybe could be as alternative payment system and replace fiat in daily transaction. with blockchain and bitcoin adoption in many place , it will attract new technology in finance industry. transaction speed and also fee will be main solution build. but its will not easy , many obstacle will appear just like how bitcoin rejected in many countries at early.
No matter on how great would be the progress but still it wont really be enough on beating up fiat system but rather they would really just still remain as an alternative or an option.
Yes, its true that we are progressing and we are seeing new ways which is way more better and capable than with the old system but cant deny that as long that government do make use of them
then it would be understandable that it would surely remain no matter what.
So its better not to be hopeful for this one because it wont surely happen.