The problem is when you look at India or Greece where withdrawals are limited, certain notes are no longer accepted etc, this creates a huge problem for the citizens of that country. What are you supposed to do if you have a lot of those bills? Deposit them and take out smaller bills? What about in the future when those bills are now gone? This is where cryptocurrency needs to be used so they never have to worry about what you're doing with your money ever again. It's yours, keep it where you want.
The thing I find the strangest is the fact that people don't want to be in control of their own wealth. It's so strange to think that you'd trust someone else with all of your money and not yourself. How stupid of a society do we have to be to keep the majority of our possessions in a bank?! Oh they have insurance, great. SO if they go bankrupt you get up to 100,000 back. Ok but anyone with 100,000 should just have their own money safely in their own arms. Having to rely on some company is completely ridiculous.