I originally thought cryptocurrencies made sense, but I've learned more about the history of money policy and currencies and think cryptocurrencies are a terrible idea. Plus cryptocurrencies take a large amount of energy because of the need or many redundant calculations whereas a bank can do a much simpler calculation once.
I think large institutions like governments and banks will implement regulated blockchain transactions, which will eliminate the advantage of cryptocurrency except for criminal enterprises, tax evaders, and anti-government fanatics.