Even if you don’t concede that bitcoin is real keeping your money in the bank will not be the answer because inflation can flatten the value, hold asset instead.
Do you know you don’t even have to save your emergency fund in the bank, you can still create a different bitcoin wallet for emergencies, you can convert to fiat when essential to handle your emergencies.
The thing is, it varies from person to person. In as much as fiat don't appreciate, and it is advisable to leave most of the asset in Bitcoin so as to give an edge against inflation, doing so for emergency funds might not necessarily be the best idea for most people, though, there are some that can definitely find a way to navigate the whole thing so they don't get their emergency funds at a loss.
But as far as savings is concerned, banks might not just be the best option. Inflation keeps rising while fiat keeps losing its value. Bitcoin should do the job.