Maybe crypto currencies will takes the place of banks in future but it can't be replaced 100% so the traditional banking will be there always but less people will going to use banks in future than now.
Cryptocurrency can not kill bank 100% but only less people will keep the money in the bank.
In my opinion, i am people who like risk to get high income. In the same time, we need to be wise also as human. Human can not life without food, so we need money to buy it. Put all money in high risk like this can be dangerous for our life so split the money to crypto and bank is much better idea.