I agree with your that investing in bitcoin is profitable than keeping some fund in the bank, but you should know that fiat is flat and bitcoin is Bitcoin. Both are important in their usage. I have said it before that bitcoin was created as an alternative to Fiat and online transaction but was not created to Totaly destroy the usefulness of fiat system. No doubt bitcoin investment is profitable but we can't invest all our fund Into bitcoin for the sake of profit. There should be certain amount for investment into bitcoin and some amount into fiat for imidiate want or fast transaction. because most people uses fiat in the bank for their business and they make profit from it and Maybe the profit they make each day is a reasonable amount that inflation can not affect so sudden. So what I want you to know is that if you put all your fund Into bitcoin, another person may not do so and you shouldn't regards such person that keeps fiat as being "ignorant" because everyone has their reasons to what they do. Who knows if he makes money in fiat and invest in bitcoin.
We still need Fiat and some funds should be set aside for our day to day activities and in cases of emergency.
Bitcoin isn't accepted every where yet and Would the fee especially in time of congestions ain't the best for micro transactions.
So for those waiting for a Dip
Bitcoin just underwent a slight fall due to news of a War
Who bought the dip?
Or still waiting for the Dip?