day by day the number of bitcoin users always increases. it may be because they can find many advantages in bitcoin. i predict there may be 85% people around the world use bitcoin in 2022 and it may not affect the damage of fiat system.
There is only 21 millions bitcoin can be mined and used. So 85% of people owning bitcoin in the future seems ridiculous. Moreover, people tend to hold bitcoin instead of spending it and I do not think that bitcoin will used as a currency in the future.